diff --git a/src/test/modules/Makefile b/src/test/modules/Makefile
index a6d2ffbf9e..59921b46cf 100644
--- a/src/test/modules/Makefile
+++ b/src/test/modules/Makefile
@@ -22,6 +22,7 @@ SUBDIRS = \
 		  test_pg_dump \
 		  test_predtest \
 		  test_rbtree \
+		  test_regex \
 		  test_rls_hooks \
 		  test_shm_mq \
 		  unsafe_tests \
diff --git a/src/test/modules/test_regex/.gitignore b/src/test/modules/test_regex/.gitignore
new file mode 100644
index 0000000000..5dcb3ff972
--- /dev/null
+++ b/src/test/modules/test_regex/.gitignore
@@ -0,0 +1,4 @@
+# Generated subdirectories
+/log/
+/results/
+/tmp_check/
diff --git a/src/test/modules/test_regex/Makefile b/src/test/modules/test_regex/Makefile
new file mode 100644
index 0000000000..dfbc5dc44b
--- /dev/null
+++ b/src/test/modules/test_regex/Makefile
@@ -0,0 +1,23 @@
+# src/test/modules/test_regex/Makefile
+
+MODULE_big = test_regex
+OBJS = \
+	$(WIN32RES) \
+	test_regex.o
+PGFILEDESC = "test_regex - test code for backend/regex/"
+
+EXTENSION = test_regex
+DATA = test_regex--1.0.sql
+
+REGRESS = test_regex test_regex_utf8
+
+ifdef USE_PGXS
+PG_CONFIG = pg_config
+PGXS := $(shell $(PG_CONFIG) --pgxs)
+include $(PGXS)
+else
+subdir = src/test/modules/test_regex
+top_builddir = ../../../..
+include $(top_builddir)/src/Makefile.global
+include $(top_srcdir)/contrib/contrib-global.mk
+endif
diff --git a/src/test/modules/test_regex/README b/src/test/modules/test_regex/README
new file mode 100644
index 0000000000..1ae358d86f
--- /dev/null
+++ b/src/test/modules/test_regex/README
@@ -0,0 +1,78 @@
+test_regex is a module for testing the regular expression package.
+It is mostly meant to allow us to absorb Tcl's regex test suite.
+Therefore, there are provisions to exercise regex features that
+aren't currently exposed at the SQL level by PostgreSQL.
+
+Currently, one function is provided:
+
+test_regex(pattern text, string text, flags text) returns setof text[]
+
+Reports an error if the pattern is an invalid regex.  Otherwise,
+the first row of output contains the number of subexpressions,
+followed by words reporting set bit(s) in the regex's re_info field.
+If the pattern doesn't match, that's all.
+If the pattern does match, the next row contains the whole match
+as the first array element.  If there are parenthesized subexpression(s),
+following array elements contain the matches to those subexpressions.
+If the "g" (glob) flag is set, then additional row(s) of output similarly
+report any additional matches.
+
+The "flags" argument is a string of zero or more single-character
+flags that modify the behavior of the regex package or the test
+function.  As described in Tcl's reg.test file:
+
+The flag characters are complex and a bit eclectic.  Generally speaking,
+lowercase letters are compile options, uppercase are expected re_info
+bits, and nonalphabetics are match options, controls for how the test is
+run, or testing options.  The one small surprise is that AREs are the
+default, and you must explicitly request lesser flavors of RE.  The flags
+are as follows.  It is admitted that some are not very mnemonic.
+
+	-	no-op (placeholder)
+	0	report indices not actual strings
+		(This substitutes for Tcl's -indices switch)
+	!	expect partial match, report start position anyway
+	%	force small state-set cache in matcher (to test cache replace)
+	^	beginning of string is not beginning of line
+	$	end of string is not end of line
+	*	test is Unicode-specific, needs big character set
+	+	provide fake xy equivalence class and ch collating element
+		(Note: the equivalence class is implemented, the
+		collating element is not; so references to [.ch.] fail)
+	,	set REG_PROGRESS (only useful in REG_DEBUG builds)
+	.	set REG_DUMP (only useful in REG_DEBUG builds)
+	:	set REG_MTRACE (only useful in REG_DEBUG builds)
+	;	set REG_FTRACE (only useful in REG_DEBUG builds)
+
+	&	test as both ARE and BRE
+		(Not implemented in Postgres, we use separate tests)
+	b	BRE
+	e	ERE
+	a	turn advanced-features bit on (error unless ERE already)
+	q	literal string, no metacharacters at all
+
+	g	global match (find all matches)
+	i	case-independent matching
+	o	("opaque") do not return match locations
+	p	newlines are half-magic, excluded from . and [^ only
+	w	newlines are half-magic, significant to ^ and $ only
+	n	newlines are fully magic, both effects
+	x	expanded RE syntax
+	t	incomplete-match reporting
+	c	canmatch (equivalent to "t0!", in Postgres implementation)
+	s	match only at start (REG_BOSONLY)
+
+	A	backslash-_a_lphanumeric seen
+	B	ERE/ARE literal-_b_race heuristic used
+	E	backslash (_e_scape) seen within []
+	H	looka_h_ead constraint seen
+	I	_i_mpossible to match
+	L	_l_ocale-specific construct seen
+	M	unportable (_m_achine-specific) construct seen
+	N	RE can match empty (_n_ull) string
+	P	non-_P_OSIX construct seen
+	Q	{} _q_uantifier seen
+	R	back _r_eference seen
+	S	POSIX-un_s_pecified syntax seen
+	T	prefers shortest (_t_iny)
+	U	saw original-POSIX botch: unmatched right paren in ERE (_u_gh)
diff --git a/src/test/modules/test_regex/expected/test_regex.out b/src/test/modules/test_regex/expected/test_regex.out
new file mode 100644
index 0000000000..b62cbac697
--- /dev/null
+++ b/src/test/modules/test_regex/expected/test_regex.out
@@ -0,0 +1,4551 @@
+-- This file is based on tests/reg.test from the Tcl distribution,
+-- which is marked
+-- # Copyright (c) 1998, 1999 Henry Spencer.  All rights reserved.
+-- The full copyright notice can be found in src/backend/regex/COPYRIGHT.
+-- Most commented lines below are copied from reg.test.  Each
+-- test case is followed by an equivalent test using test_regex().
+create extension test_regex;
+set standard_conforming_strings = on;
+-- # support functions and preliminary misc.
+-- # This is sensitive to changes in message wording, but we really have to
+-- # test the code->message expansion at least once.
+-- ::tcltest::test reg-0.1 "regexp error reporting" {
+--     list [catch {regexp (*) ign} msg] $msg
+-- } {1 {couldn't compile regular expression pattern: quantifier operand invalid}}
+select * from test_regex('(*)', '', '');
+ERROR:  invalid regular expression: quantifier operand invalid
+-- doing 1 "basic sanity checks"
+-- expectMatch	1.1 &		abc	abc		abc
+select * from test_regex('abc', 'abc', '');
+ test_regex 
+------------
+ {0}
+ {abc}
+(2 rows)
+
+select * from test_regex('abc', 'abc', 'b');
+ test_regex 
+------------
+ {0}
+ {abc}
+(2 rows)
+
+-- expectNomatch	1.2 &		abc	def
+select * from test_regex('abc', 'def', '');
+ test_regex 
+------------
+ {0}
+(1 row)
+
+select * from test_regex('abc', 'def', 'b');
+ test_regex 
+------------
+ {0}
+(1 row)
+
+-- expectMatch	1.3 &		abc	xyabxabce	abc
+select * from test_regex('abc', 'xyabxabce', '');
+ test_regex 
+------------
+ {0}
+ {abc}
+(2 rows)
+
+select * from test_regex('abc', 'xyabxabce', 'b');
+ test_regex 
+------------
+ {0}
+ {abc}
+(2 rows)
+
+-- doing 2 "invalid option combinations"
+-- expectError	2.1 qe		a	INVARG
+select * from test_regex('a', '', 'qe');
+ERROR:  invalid regular expression: invalid argument to regex function
+-- expectError	2.2 qa		a	INVARG
+select * from test_regex('a', '', 'qa');
+ERROR:  invalid regular expression: invalid argument to regex function
+-- expectError	2.3 qx		a	INVARG
+select * from test_regex('a', '', 'qx');
+ERROR:  invalid regular expression: invalid argument to regex function
+-- expectError	2.4 qn		a	INVARG
+select * from test_regex('a', '', 'qn');
+ERROR:  invalid regular expression: invalid argument to regex function
+-- expectError	2.5 ba		a	INVARG
+select * from test_regex('a', '', 'ba');
+ERROR:  invalid regular expression: invalid argument to regex function
+-- doing 3 "basic syntax"
+-- expectIndices	3.1 &NS		""	a	{0 -1}
+select * from test_regex('', 'a', '0NS');
+           test_regex            
+---------------------------------
+ {0,REG_UUNSPEC,REG_UEMPTYMATCH}
+ {"0 -1"}
+(2 rows)
+
+select * from test_regex('', 'a', '0NSb');
+           test_regex            
+---------------------------------
+ {0,REG_UUNSPEC,REG_UEMPTYMATCH}
+ {"0 -1"}
+(2 rows)
+
+-- expectMatch	3.2 NS		a|	a	a
+select * from test_regex('a|', 'a', 'NS');
+           test_regex            
+---------------------------------
+ {0,REG_UUNSPEC,REG_UEMPTYMATCH}
+ {a}
+(2 rows)
+
+-- expectMatch	3.3 -		a|b	a	a
+select * from test_regex('a|b', 'a', '-');
+ test_regex 
+------------
+ {0}
+ {a}
+(2 rows)
+
+-- expectMatch	3.4 -		a|b	b	b
+select * from test_regex('a|b', 'b', '-');
+ test_regex 
+------------
+ {0}
+ {b}
+(2 rows)
+
+-- expectMatch	3.5 NS		a||b	b	b
+select * from test_regex('a||b', 'b', 'NS');
+           test_regex            
+---------------------------------
+ {0,REG_UUNSPEC,REG_UEMPTYMATCH}
+ {b}
+(2 rows)
+
+-- expectMatch	3.6 &		ab	ab	ab
+select * from test_regex('ab', 'ab', '');
+ test_regex 
+------------
+ {0}
+ {ab}
+(2 rows)
+
+select * from test_regex('ab', 'ab', 'b');
+ test_regex 
+------------
+ {0}
+ {ab}
+(2 rows)
+
+-- doing 4 "parentheses"
+-- expectMatch	4.1  -		(a)e		ae	ae	a
+select * from test_regex('(a)e', 'ae', '-');
+ test_regex 
+------------
+ {1}
+ {ae,a}
+(2 rows)
+
+-- expectMatch	4.2  o		(a)e		ae
+select * from test_regex('(a)e', 'ae', 'o');
+ test_regex 
+------------
+ {0}
+ {NULL}
+(2 rows)
+
+-- expectMatch	4.3  b		{\(a\)b}	ab	ab	a
+select * from test_regex('\(a\)b', 'ab', 'b');
+ test_regex 
+------------
+ {1}
+ {ab,a}
+(2 rows)
+
+-- expectMatch	4.4  -		a((b)c)		abc	abc	bc	b
+select * from test_regex('a((b)c)', 'abc', '-');
+ test_regex 
+------------
+ {2}
+ {abc,bc,b}
+(2 rows)
+
+-- expectMatch	4.5  -		a(b)(c)		abc	abc	b	c
+select * from test_regex('a(b)(c)', 'abc', '-');
+ test_regex 
+------------
+ {2}
+ {abc,b,c}
+(2 rows)
+
+-- expectError	4.6  -		a(b		EPAREN
+select * from test_regex('a(b', '', '-');
+ERROR:  invalid regular expression: parentheses () not balanced
+-- expectError	4.7  b		{a\(b}		EPAREN
+select * from test_regex('a\(b', '', 'b');
+ERROR:  invalid regular expression: parentheses () not balanced
+-- # sigh, we blew it on the specs here... someday this will be fixed in POSIX,
+-- #  but meanwhile, it's fixed in AREs
+-- expectMatch	4.8  eU		a)b		a)b	a)b
+select * from test_regex('a)b', 'a)b', 'eU');
+   test_regex    
+-----------------
+ {0,REG_UPBOTCH}
+ {a)b}
+(2 rows)
+
+-- expectError	4.9  -		a)b		EPAREN
+select * from test_regex('a)b', '', '-');
+ERROR:  invalid regular expression: parentheses () not balanced
+-- expectError	4.10 b		{a\)b}		EPAREN
+select * from test_regex('a\)b', '', 'b');
+ERROR:  invalid regular expression: parentheses () not balanced
+-- expectMatch	4.11 P		a(?:b)c		abc	abc
+select * from test_regex('a(?:b)c', 'abc', 'P');
+    test_regex     
+-------------------
+ {0,REG_UNONPOSIX}
+ {abc}
+(2 rows)
+
+-- expectError	4.12 e		a(?:b)c		BADRPT
+select * from test_regex('a(?:b)c', '', 'e');
+ERROR:  invalid regular expression: quantifier operand invalid
+-- expectIndices	4.13 S		a()b		ab	{0 1}	{1 0}
+select * from test_regex('a()b', 'ab', '0S');
+   test_regex    
+-----------------
+ {1,REG_UUNSPEC}
+ {"0 1","1 0"}
+(2 rows)
+
+-- expectMatch	4.14 SP		a(?:)b		ab	ab
+select * from test_regex('a(?:)b', 'ab', 'SP');
+          test_regex           
+-------------------------------
+ {0,REG_UNONPOSIX,REG_UUNSPEC}
+ {ab}
+(2 rows)
+
+-- expectIndices	4.15 S		a(|b)c		ac	{0 1}	{1 0}
+select * from test_regex('a(|b)c', 'ac', '0S');
+   test_regex    
+-----------------
+ {1,REG_UUNSPEC}
+ {"0 1","1 0"}
+(2 rows)
+
+-- expectMatch	4.16 S		a(b|)c		abc	abc	b
+select * from test_regex('a(b|)c', 'abc', 'S');
+   test_regex    
+-----------------
+ {1,REG_UUNSPEC}
+ {abc,b}
+(2 rows)
+
+-- doing 5 "simple one-char matching"
+-- # general case of brackets done later
+-- expectMatch	5.1 &		a.b		axb	axb
+select * from test_regex('a.b', 'axb', '');
+ test_regex 
+------------
+ {0}
+ {axb}
+(2 rows)
+
+select * from test_regex('a.b', 'axb', 'b');
+ test_regex 
+------------
+ {0}
+ {axb}
+(2 rows)
+
+-- expectNomatch	5.2 &n		"a.b"		"a\nb"
+select * from test_regex('a.b', E'a\nb', 'n');
+ test_regex 
+------------
+ {0}
+(1 row)
+
+select * from test_regex('a.b', E'a\nb', 'nb');
+ test_regex 
+------------
+ {0}
+(1 row)
+
+-- expectMatch	5.3 &		{a[bc]d}	abd	abd
+select * from test_regex('a[bc]d', 'abd', '');
+ test_regex 
+------------
+ {0}
+ {abd}
+(2 rows)
+
+select * from test_regex('a[bc]d', 'abd', 'b');
+ test_regex 
+------------
+ {0}
+ {abd}
+(2 rows)
+
+-- expectMatch	5.4 &		{a[bc]d}	acd	acd
+select * from test_regex('a[bc]d', 'acd', '');
+ test_regex 
+------------
+ {0}
+ {acd}
+(2 rows)
+
+select * from test_regex('a[bc]d', 'acd', 'b');
+ test_regex 
+------------
+ {0}
+ {acd}
+(2 rows)
+
+-- expectNomatch	5.5 &		{a[bc]d}	aed
+select * from test_regex('a[bc]d', 'aed', '');
+ test_regex 
+------------
+ {0}
+(1 row)
+
+select * from test_regex('a[bc]d', 'aed', 'b');
+ test_regex 
+------------
+ {0}
+(1 row)
+
+-- expectNomatch	5.6 &		{a[^bc]d}	abd
+select * from test_regex('a[^bc]d', 'abd', '');
+ test_regex 
+------------
+ {0}
+(1 row)
+
+select * from test_regex('a[^bc]d', 'abd', 'b');
+ test_regex 
+------------
+ {0}
+(1 row)
+
+-- expectMatch	5.7 &		{a[^bc]d}	aed	aed
+select * from test_regex('a[^bc]d', 'aed', '');
+ test_regex 
+------------
+ {0}
+ {aed}
+(2 rows)
+
+select * from test_regex('a[^bc]d', 'aed', 'b');
+ test_regex 
+------------
+ {0}
+ {aed}
+(2 rows)
+
+-- expectNomatch	5.8 &p		"a\[^bc]d"	"a\nd"
+select * from test_regex('a[^bc]d', E'a\nd', 'p');
+ test_regex 
+------------
+ {0}
+(1 row)
+
+select * from test_regex('a[^bc]d', E'a\nd', 'pb');
+ test_regex 
+------------
+ {0}
+(1 row)
+
+-- doing 6 "context-dependent syntax"
+-- # plus odds and ends
+-- expectError	6.1  -		*	BADRPT
+select * from test_regex('*', '', '-');
+ERROR:  invalid regular expression: quantifier operand invalid
+-- expectMatch	6.2  b		*	*	*
+select * from test_regex('*', '*', 'b');
+ test_regex 
+------------
+ {0}
+ {*}
+(2 rows)
+
+-- expectMatch	6.3  b		{\(*\)}	*	*	*
+select * from test_regex('\(*\)', '*', 'b');
+ test_regex 
+------------
+ {1}
+ {*,*}
+(2 rows)
+
+-- expectError	6.4  -		(*)	BADRPT
+select * from test_regex('(*)', '', '-');
+ERROR:  invalid regular expression: quantifier operand invalid
+-- expectMatch	6.5  b		^*	*	*
+select * from test_regex('^*', '*', 'b');
+ test_regex 
+------------
+ {0}
+ {*}
+(2 rows)
+
+-- expectError	6.6  -		^*	BADRPT
+select * from test_regex('^*', '', '-');
+ERROR:  invalid regular expression: quantifier operand invalid
+-- expectNomatch	6.7  &		^b	^b
+select * from test_regex('^b', '^b', '');
+ test_regex 
+------------
+ {0}
+(1 row)
+
+select * from test_regex('^b', '^b', 'b');
+ test_regex 
+------------
+ {0}
+(1 row)
+
+-- expectMatch	6.8  b		x^	x^	x^
+select * from test_regex('x^', 'x^', 'b');
+ test_regex 
+------------
+ {0}
+ {x^}
+(2 rows)
+
+-- expectNomatch	6.9  I		x^	x
+select * from test_regex('x^', 'x', 'I');
+     test_regex      
+---------------------
+ {0,REG_UIMPOSSIBLE}
+(1 row)
+
+-- expectMatch	6.10 n		"\n^"	"x\nb"	"\n"
+select * from test_regex(E'\n^', E'x\nb', 'n');
+ test_regex 
+------------
+ {0}
+ {"        +
+ "}
+(2 rows)
+
+-- expectNomatch	6.11 bS		{\(^b\)} ^b
+select * from test_regex('\(^b\)', '^b', 'bS');
+   test_regex    
+-----------------
+ {1,REG_UUNSPEC}
+(1 row)
+
+-- expectMatch	6.12 -		(^b)	b	b	b
+select * from test_regex('(^b)', 'b', '-');
+ test_regex 
+------------
+ {1}
+ {b,b}
+(2 rows)
+
+-- expectMatch	6.13 &		{x$}	x	x
+select * from test_regex('x$', 'x', '');
+ test_regex 
+------------
+ {0}
+ {x}
+(2 rows)
+
+select * from test_regex('x$', 'x', 'b');
+ test_regex 
+------------
+ {0}
+ {x}
+(2 rows)
+
+-- expectMatch	6.14 bS		{\(x$\)} x	x	x
+select * from test_regex('\(x$\)', 'x', 'bS');
+   test_regex    
+-----------------
+ {1,REG_UUNSPEC}
+ {x,x}
+(2 rows)
+
+-- expectMatch	6.15 -		{(x$)}	x	x	x
+select * from test_regex('(x$)', 'x', '-');
+ test_regex 
+------------
+ {1}
+ {x,x}
+(2 rows)
+
+-- expectMatch	6.16 b		{x$y}	"x\$y"	"x\$y"
+select * from test_regex('x$y', 'x$y', 'b');
+ test_regex 
+------------
+ {0}
+ {x$y}
+(2 rows)
+
+-- expectNomatch	6.17 I		{x$y}	xy
+select * from test_regex('x$y', 'xy', 'I');
+     test_regex      
+---------------------
+ {0,REG_UIMPOSSIBLE}
+(1 row)
+
+-- expectMatch	6.18 n		"x\$\n"	"x\n"	"x\n"
+select * from test_regex(E'x$\n', E'x\n', 'n');
+ test_regex 
+------------
+ {0}
+ {"x       +
+ "}
+(2 rows)
+
+-- expectError	6.19 -		+	BADRPT
+select * from test_regex('+', '', '-');
+ERROR:  invalid regular expression: quantifier operand invalid
+-- expectError	6.20 -		?	BADRPT
+select * from test_regex('?', '', '-');
+ERROR:  invalid regular expression: quantifier operand invalid
+-- These two are not yet incorporated in Tcl, cf
+-- https://core.tcl-lang.org/tcl/artifact/106269fa65d96b83
+-- expectError	6.21 -		{x(\w)(?=(\1))}	ESUBREG
+select * from test_regex('x(\w)(?=(\1))', '', '-');
+ERROR:  invalid regular expression: invalid backreference number
+-- expectMatch	6.22 HP		{x(?=((foo)))}	xfoo	x
+select * from test_regex('x(?=((foo)))', 'xfoo', 'HP');
+            test_regex             
+-----------------------------------
+ {0,REG_ULOOKAROUND,REG_UNONPOSIX}
+ {x}
+(2 rows)
+
+-- doing 7 "simple quantifiers"
+-- expectMatch	7.1  &N		a*	aa	aa
+select * from test_regex('a*', 'aa', 'N');
+     test_regex      
+---------------------
+ {0,REG_UEMPTYMATCH}
+ {aa}
+(2 rows)
+
+select * from test_regex('a*', 'aa', 'Nb');
+     test_regex      
+---------------------
+ {0,REG_UEMPTYMATCH}
+ {aa}
+(2 rows)
+
+-- expectIndices	7.2  &N		a*	b	{0 -1}
+select * from test_regex('a*', 'b', '0N');
+     test_regex      
+---------------------
+ {0,REG_UEMPTYMATCH}
+ {"0 -1"}
+(2 rows)
+
+select * from test_regex('a*', 'b', '0Nb');
+     test_regex      
+---------------------
+ {0,REG_UEMPTYMATCH}
+ {"0 -1"}
+(2 rows)
+
+-- expectMatch	7.3  -		a+	aa	aa
+select * from test_regex('a+', 'aa', '-');
+ test_regex 
+------------
+ {0}
+ {aa}
+(2 rows)
+
+-- expectMatch	7.4  -		a?b	ab	ab
+select * from test_regex('a?b', 'ab', '-');
+ test_regex 
+------------
+ {0}
+ {ab}
+(2 rows)
+
+-- expectMatch	7.5  -		a?b	b	b
+select * from test_regex('a?b', 'b', '-');
+ test_regex 
+------------
+ {0}
+ {b}
+(2 rows)
+
+-- expectError	7.6  -		**	BADRPT
+select * from test_regex('**', '', '-');
+ERROR:  invalid regular expression: quantifier operand invalid
+-- expectMatch	7.7  bN		**	***	***
+select * from test_regex('**', '***', 'bN');
+     test_regex      
+---------------------
+ {0,REG_UEMPTYMATCH}
+ {***}
+(2 rows)
+
+-- expectError	7.8  &		a**	BADRPT
+select * from test_regex('a**', '', '');
+ERROR:  invalid regular expression: quantifier operand invalid
+select * from test_regex('a**', '', 'b');
+ERROR:  invalid regular expression: quantifier operand invalid
+-- expectError	7.9  &		a**b	BADRPT
+select * from test_regex('a**b', '', '');
+ERROR:  invalid regular expression: quantifier operand invalid
+select * from test_regex('a**b', '', 'b');
+ERROR:  invalid regular expression: quantifier operand invalid
+-- expectError	7.10 &		***	BADRPT
+select * from test_regex('***', '', '');
+ERROR:  invalid regular expression: quantifier operand invalid
+select * from test_regex('***', '', 'b');
+ERROR:  invalid regular expression: quantifier operand invalid
+-- expectError	7.11 -		a++	BADRPT
+select * from test_regex('a++', '', '-');
+ERROR:  invalid regular expression: quantifier operand invalid
+-- expectError	7.12 -		a?+	BADRPT
+select * from test_regex('a?+', '', '-');
+ERROR:  invalid regular expression: quantifier operand invalid
+-- expectError	7.13 -		a?*	BADRPT
+select * from test_regex('a?*', '', '-');
+ERROR:  invalid regular expression: quantifier operand invalid
+-- expectError	7.14 -		a+*	BADRPT
+select * from test_regex('a+*', '', '-');
+ERROR:  invalid regular expression: quantifier operand invalid
+-- expectError	7.15 -		a*+	BADRPT
+select * from test_regex('a*+', '', '-');
+ERROR:  invalid regular expression: quantifier operand invalid
+-- doing 8 "braces"
+-- expectMatch	8.1  NQ		"a{0,1}"	""	""
+select * from test_regex('a{0,1}', '', 'NQ');
+           test_regex            
+---------------------------------
+ {0,REG_UBOUNDS,REG_UEMPTYMATCH}
+ {""}
+(2 rows)
+
+-- expectMatch	8.2  NQ		"a{0,1}"	ac	a
+select * from test_regex('a{0,1}', 'ac', 'NQ');
+           test_regex            
+---------------------------------
+ {0,REG_UBOUNDS,REG_UEMPTYMATCH}
+ {a}
+(2 rows)
+
+-- expectError	8.3  -		"a{1,0}"	BADBR
+select * from test_regex('a{1,0}', '', '-');
+ERROR:  invalid regular expression: invalid repetition count(s)
+-- expectError	8.4  -		"a{1,2,3}"	BADBR
+select * from test_regex('a{1,2,3}', '', '-');
+ERROR:  invalid regular expression: invalid repetition count(s)
+-- expectError	8.5  -		"a{257}"	BADBR
+select * from test_regex('a{257}', '', '-');
+ERROR:  invalid regular expression: invalid repetition count(s)
+-- expectError	8.6  -		"a{1000}"	BADBR
+select * from test_regex('a{1000}', '', '-');
+ERROR:  invalid regular expression: invalid repetition count(s)
+-- expectError	8.7  -		"a{1"		EBRACE
+select * from test_regex('a{1', '', '-');
+ERROR:  invalid regular expression: braces {} not balanced
+-- expectError	8.8  -		"a{1n}"		BADBR
+select * from test_regex('a{1n}', '', '-');
+ERROR:  invalid regular expression: invalid repetition count(s)
+-- expectMatch	8.9  BS		"a{b"		"a\{b"	"a\{b"
+select * from test_regex('a{b', 'a{b', 'BS');
+         test_regex          
+-----------------------------
+ {0,REG_UBRACES,REG_UUNSPEC}
+ {"a{b"}
+(2 rows)
+
+-- expectMatch	8.10 BS		"a{"		"a\{"	"a\{"
+select * from test_regex('a{', 'a{', 'BS');
+         test_regex          
+-----------------------------
+ {0,REG_UBRACES,REG_UUNSPEC}
+ {"a{"}
+(2 rows)
+
+-- expectMatch	8.11 bQ		"a\\{0,1\\}b"	cb	b
+select * from test_regex('a\{0,1\}b', 'cb', 'bQ');
+   test_regex    
+-----------------
+ {0,REG_UBOUNDS}
+ {b}
+(2 rows)
+
+-- expectError	8.12 b		"a\\{0,1"	EBRACE
+select * from test_regex('a\{0,1', '', 'b');
+ERROR:  invalid regular expression: braces {} not balanced
+-- expectError	8.13 -		"a{0,1\\"	BADBR
+select * from test_regex('a{0,1\', '', '-');
+ERROR:  invalid regular expression: invalid repetition count(s)
+-- expectMatch	8.14 Q		"a{0}b"		ab	b
+select * from test_regex('a{0}b', 'ab', 'Q');
+   test_regex    
+-----------------
+ {0,REG_UBOUNDS}
+ {b}
+(2 rows)
+
+-- expectMatch	8.15 Q		"a{0,0}b"	ab	b
+select * from test_regex('a{0,0}b', 'ab', 'Q');
+   test_regex    
+-----------------
+ {0,REG_UBOUNDS}
+ {b}
+(2 rows)
+
+-- expectMatch	8.16 Q		"a{0,1}b"	ab	ab
+select * from test_regex('a{0,1}b', 'ab', 'Q');
+   test_regex    
+-----------------
+ {0,REG_UBOUNDS}
+ {ab}
+(2 rows)
+
+-- expectMatch	8.17 Q		"a{0,2}b"	b	b
+select * from test_regex('a{0,2}b', 'b', 'Q');
+   test_regex    
+-----------------
+ {0,REG_UBOUNDS}
+ {b}
+(2 rows)
+
+-- expectMatch	8.18 Q		"a{0,2}b"	aab	aab
+select * from test_regex('a{0,2}b', 'aab', 'Q');
+   test_regex    
+-----------------
+ {0,REG_UBOUNDS}
+ {aab}
+(2 rows)
+
+-- expectMatch	8.19 Q		"a{0,}b"	aab	aab
+select * from test_regex('a{0,}b', 'aab', 'Q');
+   test_regex    
+-----------------
+ {0,REG_UBOUNDS}
+ {aab}
+(2 rows)
+
+-- expectMatch	8.20 Q		"a{1,1}b"	aab	ab
+select * from test_regex('a{1,1}b', 'aab', 'Q');
+   test_regex    
+-----------------
+ {0,REG_UBOUNDS}
+ {ab}
+(2 rows)
+
+-- expectMatch	8.21 Q		"a{1,3}b"	aaaab	aaab
+select * from test_regex('a{1,3}b', 'aaaab', 'Q');
+   test_regex    
+-----------------
+ {0,REG_UBOUNDS}
+ {aaab}
+(2 rows)
+
+-- expectNomatch	8.22 Q		"a{1,3}b"	b
+select * from test_regex('a{1,3}b', 'b', 'Q');
+   test_regex    
+-----------------
+ {0,REG_UBOUNDS}
+(1 row)
+
+-- expectMatch	8.23 Q		"a{1,}b"	aab	aab
+select * from test_regex('a{1,}b', 'aab', 'Q');
+   test_regex    
+-----------------
+ {0,REG_UBOUNDS}
+ {aab}
+(2 rows)
+
+-- expectNomatch	8.24 Q		"a{2,3}b"	ab
+select * from test_regex('a{2,3}b', 'ab', 'Q');
+   test_regex    
+-----------------
+ {0,REG_UBOUNDS}
+(1 row)
+
+-- expectMatch	8.25 Q		"a{2,3}b"	aaaab	aaab
+select * from test_regex('a{2,3}b', 'aaaab', 'Q');
+   test_regex    
+-----------------
+ {0,REG_UBOUNDS}
+ {aaab}
+(2 rows)
+
+-- expectNomatch	8.26 Q		"a{2,}b"	ab
+select * from test_regex('a{2,}b', 'ab', 'Q');
+   test_regex    
+-----------------
+ {0,REG_UBOUNDS}
+(1 row)
+
+-- expectMatch	8.27 Q		"a{2,}b"	aaaab	aaaab
+select * from test_regex('a{2,}b', 'aaaab', 'Q');
+   test_regex    
+-----------------
+ {0,REG_UBOUNDS}
+ {aaaab}
+(2 rows)
+
+-- doing 9 "brackets"
+-- expectMatch	9.1  &		{a[bc]}		ac	ac
+select * from test_regex('a[bc]', 'ac', '');
+ test_regex 
+------------
+ {0}
+ {ac}
+(2 rows)
+
+select * from test_regex('a[bc]', 'ac', 'b');
+ test_regex 
+------------
+ {0}
+ {ac}
+(2 rows)
+
+-- expectMatch	9.2  &		{a[-]}		a-	a-
+select * from test_regex('a[-]', 'a-', '');
+ test_regex 
+------------
+ {0}
+ {a-}
+(2 rows)
+
+select * from test_regex('a[-]', 'a-', 'b');
+ test_regex 
+------------
+ {0}
+ {a-}
+(2 rows)
+
+-- expectMatch	9.3  &		{a[[.-.]]}	a-	a-
+select * from test_regex('a[[.-.]]', 'a-', '');
+ test_regex 
+------------
+ {0}
+ {a-}
+(2 rows)
+
+select * from test_regex('a[[.-.]]', 'a-', 'b');
+ test_regex 
+------------
+ {0}
+ {a-}
+(2 rows)
+
+-- expectMatch	9.4  &L		{a[[.zero.]]}	a0	a0
+select * from test_regex('a[[.zero.]]', 'a0', 'L');
+   test_regex    
+-----------------
+ {0,REG_ULOCALE}
+ {a0}
+(2 rows)
+
+select * from test_regex('a[[.zero.]]', 'a0', 'Lb');
+   test_regex    
+-----------------
+ {0,REG_ULOCALE}
+ {a0}
+(2 rows)
+
+-- expectMatch	9.5  &LM	{a[[.zero.]-9]}	a2	a2
+select * from test_regex('a[[.zero.]-9]', 'a2', 'LM');
+         test_regex          
+-----------------------------
+ {0,REG_UUNPORT,REG_ULOCALE}
+ {a2}
+(2 rows)
+
+select * from test_regex('a[[.zero.]-9]', 'a2', 'LMb');
+         test_regex          
+-----------------------------
+ {0,REG_UUNPORT,REG_ULOCALE}
+ {a2}
+(2 rows)
+
+-- expectMatch	9.6  &M		{a[0-[.9.]]}	a2	a2
+select * from test_regex('a[0-[.9.]]', 'a2', 'M');
+   test_regex    
+-----------------
+ {0,REG_UUNPORT}
+ {a2}
+(2 rows)
+
+select * from test_regex('a[0-[.9.]]', 'a2', 'Mb');
+   test_regex    
+-----------------
+ {0,REG_UUNPORT}
+ {a2}
+(2 rows)
+
+-- expectMatch	9.7  &+L	{a[[=x=]]}	ax	ax
+select * from test_regex('a[[=x=]]', 'ax', '+L');
+   test_regex    
+-----------------
+ {0,REG_ULOCALE}
+ {ax}
+(2 rows)
+
+select * from test_regex('a[[=x=]]', 'ax', '+Lb');
+   test_regex    
+-----------------
+ {0,REG_ULOCALE}
+ {ax}
+(2 rows)
+
+-- expectMatch	9.8  &+L	{a[[=x=]]}	ay	ay
+select * from test_regex('a[[=x=]]', 'ay', '+L');
+   test_regex    
+-----------------
+ {0,REG_ULOCALE}
+ {ay}
+(2 rows)
+
+select * from test_regex('a[[=x=]]', 'ay', '+Lb');
+   test_regex    
+-----------------
+ {0,REG_ULOCALE}
+ {ay}
+(2 rows)
+
+-- expectNomatch	9.9  &+L	{a[[=x=]]}	az
+select * from test_regex('a[[=x=]]', 'az', '+L');
+   test_regex    
+-----------------
+ {0,REG_ULOCALE}
+(1 row)
+
+select * from test_regex('a[[=x=]]', 'az', '+Lb');
+   test_regex    
+-----------------
+ {0,REG_ULOCALE}
+(1 row)
+
+-- expectError	9.10 &		{a[0-[=x=]]}	ERANGE
+select * from test_regex('a[0-[=x=]]', '', '');
+ERROR:  invalid regular expression: invalid character range
+select * from test_regex('a[0-[=x=]]', '', 'b');
+ERROR:  invalid regular expression: invalid character range
+-- expectMatch	9.11 &L		{a[[:digit:]]}	a0	a0
+select * from test_regex('a[[:digit:]]', 'a0', 'L');
+   test_regex    
+-----------------
+ {0,REG_ULOCALE}
+ {a0}
+(2 rows)
+
+select * from test_regex('a[[:digit:]]', 'a0', 'Lb');
+   test_regex    
+-----------------
+ {0,REG_ULOCALE}
+ {a0}
+(2 rows)
+
+-- expectError	9.12 &		{a[[:woopsie:]]}	ECTYPE
+select * from test_regex('a[[:woopsie:]]', '', '');
+ERROR:  invalid regular expression: invalid character class
+select * from test_regex('a[[:woopsie:]]', '', 'b');
+ERROR:  invalid regular expression: invalid character class
+-- expectNomatch	9.13 &L		{a[[:digit:]]}	ab
+select * from test_regex('a[[:digit:]]', 'ab', 'L');
+   test_regex    
+-----------------
+ {0,REG_ULOCALE}
+(1 row)
+
+select * from test_regex('a[[:digit:]]', 'ab', 'Lb');
+   test_regex    
+-----------------
+ {0,REG_ULOCALE}
+(1 row)
+
+-- expectError	9.14 &		{a[0-[:digit:]]}	ERANGE
+select * from test_regex('a[0-[:digit:]]', '', '');
+ERROR:  invalid regular expression: invalid character range
+select * from test_regex('a[0-[:digit:]]', '', 'b');
+ERROR:  invalid regular expression: invalid character range
+-- expectMatch	9.15 &LP	{[[:<:]]a}	a	a
+select * from test_regex('[[:<:]]a', 'a', 'LP');
+          test_regex           
+-------------------------------
+ {0,REG_UNONPOSIX,REG_ULOCALE}
+ {a}
+(2 rows)
+
+select * from test_regex('[[:<:]]a', 'a', 'LPb');
+          test_regex           
+-------------------------------
+ {0,REG_UNONPOSIX,REG_ULOCALE}
+ {a}
+(2 rows)
+
+-- expectMatch	9.16 &LP	{a[[:>:]]}	a	a
+select * from test_regex('a[[:>:]]', 'a', 'LP');
+          test_regex           
+-------------------------------
+ {0,REG_UNONPOSIX,REG_ULOCALE}
+ {a}
+(2 rows)
+
+select * from test_regex('a[[:>:]]', 'a', 'LPb');
+          test_regex           
+-------------------------------
+ {0,REG_UNONPOSIX,REG_ULOCALE}
+ {a}
+(2 rows)
+
+-- expectError	9.17 &		{a[[..]]b}	ECOLLATE
+select * from test_regex('a[[..]]b', '', '');
+ERROR:  invalid regular expression: invalid collating element
+select * from test_regex('a[[..]]b', '', 'b');
+ERROR:  invalid regular expression: invalid collating element
+-- expectError	9.18 &		{a[[==]]b}	ECOLLATE
+select * from test_regex('a[[==]]b', '', '');
+ERROR:  invalid regular expression: invalid collating element
+select * from test_regex('a[[==]]b', '', 'b');
+ERROR:  invalid regular expression: invalid collating element
+-- expectError	9.19 &		{a[[::]]b}	ECTYPE
+select * from test_regex('a[[::]]b', '', '');
+ERROR:  invalid regular expression: invalid character class
+select * from test_regex('a[[::]]b', '', 'b');
+ERROR:  invalid regular expression: invalid character class
+-- expectError	9.20 &		{a[[.a}		EBRACK
+select * from test_regex('a[[.a', '', '');
+ERROR:  invalid regular expression: brackets [] not balanced
+select * from test_regex('a[[.a', '', 'b');
+ERROR:  invalid regular expression: brackets [] not balanced
+-- expectError	9.21 &		{a[[=a}		EBRACK
+select * from test_regex('a[[=a', '', '');
+ERROR:  invalid regular expression: brackets [] not balanced
+select * from test_regex('a[[=a', '', 'b');
+ERROR:  invalid regular expression: brackets [] not balanced
+-- expectError	9.22 &		{a[[:a}		EBRACK
+select * from test_regex('a[[:a', '', '');
+ERROR:  invalid regular expression: brackets [] not balanced
+select * from test_regex('a[[:a', '', 'b');
+ERROR:  invalid regular expression: brackets [] not balanced
+-- expectError	9.23 &		{a[}		EBRACK
+select * from test_regex('a[', '', '');
+ERROR:  invalid regular expression: brackets [] not balanced
+select * from test_regex('a[', '', 'b');
+ERROR:  invalid regular expression: brackets [] not balanced
+-- expectError	9.24 &		{a[b}		EBRACK
+select * from test_regex('a[b', '', '');
+ERROR:  invalid regular expression: brackets [] not balanced
+select * from test_regex('a[b', '', 'b');
+ERROR:  invalid regular expression: brackets [] not balanced
+-- expectError	9.25 &		{a[b-}		EBRACK
+select * from test_regex('a[b-', '', '');
+ERROR:  invalid regular expression: brackets [] not balanced
+select * from test_regex('a[b-', '', 'b');
+ERROR:  invalid regular expression: brackets [] not balanced
+-- expectError	9.26 &		{a[b-c}		EBRACK
+select * from test_regex('a[b-c', '', '');
+ERROR:  invalid regular expression: brackets [] not balanced
+select * from test_regex('a[b-c', '', 'b');
+ERROR:  invalid regular expression: brackets [] not balanced
+-- expectMatch	9.27 &M		{a[b-c]}	ab	ab
+select * from test_regex('a[b-c]', 'ab', 'M');
+   test_regex    
+-----------------
+ {0,REG_UUNPORT}
+ {ab}
+(2 rows)
+
+select * from test_regex('a[b-c]', 'ab', 'Mb');
+   test_regex    
+-----------------
+ {0,REG_UUNPORT}
+ {ab}
+(2 rows)
+
+-- expectMatch	9.28 &		{a[b-b]}	ab	ab
+select * from test_regex('a[b-b]', 'ab', '');
+ test_regex 
+------------
+ {0}
+ {ab}
+(2 rows)
+
+select * from test_regex('a[b-b]', 'ab', 'b');
+ test_regex 
+------------
+ {0}
+ {ab}
+(2 rows)
+
+-- expectMatch	9.29 &M		{a[1-2]}	a2	a2
+select * from test_regex('a[1-2]', 'a2', 'M');
+   test_regex    
+-----------------
+ {0,REG_UUNPORT}
+ {a2}
+(2 rows)
+
+select * from test_regex('a[1-2]', 'a2', 'Mb');
+   test_regex    
+-----------------
+ {0,REG_UUNPORT}
+ {a2}
+(2 rows)
+
+-- expectError	9.30 &		{a[c-b]}	ERANGE
+select * from test_regex('a[c-b]', '', '');
+ERROR:  invalid regular expression: invalid character range
+select * from test_regex('a[c-b]', '', 'b');
+ERROR:  invalid regular expression: invalid character range
+-- expectError	9.31 &		{a[a-b-c]}	ERANGE
+select * from test_regex('a[a-b-c]', '', '');
+ERROR:  invalid regular expression: invalid character range
+select * from test_regex('a[a-b-c]', '', 'b');
+ERROR:  invalid regular expression: invalid character range
+-- expectMatch	9.32 &M		{a[--?]b}	a?b	a?b
+select * from test_regex('a[--?]b', 'a?b', 'M');
+   test_regex    
+-----------------
+ {0,REG_UUNPORT}
+ {a?b}
+(2 rows)
+
+select * from test_regex('a[--?]b', 'a?b', 'Mb');
+   test_regex    
+-----------------
+ {0,REG_UUNPORT}
+ {a?b}
+(2 rows)
+
+-- expectMatch	9.33 &		{a[---]b}	a-b	a-b
+select * from test_regex('a[---]b', 'a-b', '');
+ test_regex 
+------------
+ {0}
+ {a-b}
+(2 rows)
+
+select * from test_regex('a[---]b', 'a-b', 'b');
+ test_regex 
+------------
+ {0}
+ {a-b}
+(2 rows)
+
+-- expectMatch	9.34 &		{a[]b]c}	a]c	a]c
+select * from test_regex('a[]b]c', 'a]c', '');
+ test_regex 
+------------
+ {0}
+ {a]c}
+(2 rows)
+
+select * from test_regex('a[]b]c', 'a]c', 'b');
+ test_regex 
+------------
+ {0}
+ {a]c}
+(2 rows)
+
+-- expectMatch	9.35 EP		{a[\]]b}	a]b	a]b
+select * from test_regex('a[\]]b', 'a]b', 'EP');
+         test_regex         
+----------------------------
+ {0,REG_UBBS,REG_UNONPOSIX}
+ {a]b}
+(2 rows)
+
+-- expectNomatch	9.36 bE		{a[\]]b}	a]b
+select * from test_regex('a[\]]b', 'a]b', 'bE');
+  test_regex  
+--------------
+ {0,REG_UBBS}
+(1 row)
+
+-- expectMatch	9.37 bE		{a[\]]b}	"a\\]b"	"a\\]b"
+select * from test_regex('a[\]]b', 'a\]b', 'bE');
+  test_regex  
+--------------
+ {0,REG_UBBS}
+ {"a\\]b"}
+(2 rows)
+
+-- expectMatch	9.38 eE		{a[\]]b}	"a\\]b"	"a\\]b"
+select * from test_regex('a[\]]b', 'a\]b', 'eE');
+  test_regex  
+--------------
+ {0,REG_UBBS}
+ {"a\\]b"}
+(2 rows)
+
+-- expectMatch	9.39 EP		{a[\\]b}	"a\\b"	"a\\b"
+select * from test_regex('a[\\]b', 'a\b', 'EP');
+         test_regex         
+----------------------------
+ {0,REG_UBBS,REG_UNONPOSIX}
+ {"a\\b"}
+(2 rows)
+
+-- expectMatch	9.40 eE		{a[\\]b}	"a\\b"	"a\\b"
+select * from test_regex('a[\\]b', 'a\b', 'eE');
+  test_regex  
+--------------
+ {0,REG_UBBS}
+ {"a\\b"}
+(2 rows)
+
+-- expectMatch	9.41 bE		{a[\\]b}	"a\\b"	"a\\b"
+select * from test_regex('a[\\]b', 'a\b', 'bE');
+  test_regex  
+--------------
+ {0,REG_UBBS}
+ {"a\\b"}
+(2 rows)
+
+-- expectError	9.42 -		{a[\Z]b}	EESCAPE
+select * from test_regex('a[\Z]b', '', '-');
+ERROR:  invalid regular expression: invalid escape \ sequence
+-- expectMatch	9.43 &		{a[[b]c}	"a\[c"	"a\[c"
+select * from test_regex('a[[b]c', 'a[c', '');
+ test_regex 
+------------
+ {0}
+ {a[c}
+(2 rows)
+
+select * from test_regex('a[[b]c', 'a[c', 'b');
+ test_regex 
+------------
+ {0}
+ {a[c}
+(2 rows)
+
+-- This only works in UTF8 encoding, so it's moved to test_regex_utf8.sql:
+-- expectMatch	9.44 EMP*	{a[\u00fe-\u0507][\u00ff-\u0300]b} \
+-- 	"a\u0102\u02ffb"	"a\u0102\u02ffb"
+-- doing 10 "anchors and newlines"
+-- expectMatch	10.1  &		^a	a	a
+select * from test_regex('^a', 'a', '');
+ test_regex 
+------------
+ {0}
+ {a}
+(2 rows)
+
+select * from test_regex('^a', 'a', 'b');
+ test_regex 
+------------
+ {0}
+ {a}
+(2 rows)
+
+-- expectNomatch	10.2  &^	^a	a
+select * from test_regex('^a', 'a', '^');
+ test_regex 
+------------
+ {0}
+(1 row)
+
+select * from test_regex('^a', 'a', '^b');
+ test_regex 
+------------
+ {0}
+(1 row)
+
+-- expectIndices	10.3  &N	^	a	{0 -1}
+select * from test_regex('^', 'a', '0N');
+     test_regex      
+---------------------
+ {0,REG_UEMPTYMATCH}
+ {"0 -1"}
+(2 rows)
+
+select * from test_regex('^', 'a', '0Nb');
+     test_regex      
+---------------------
+ {0,REG_UEMPTYMATCH}
+ {"0 -1"}
+(2 rows)
+
+-- expectIndices	10.4  &		{a$}	aba	{2 2}
+select * from test_regex('a$', 'aba', '0');
+ test_regex 
+------------
+ {0}
+ {"2 2"}
+(2 rows)
+
+select * from test_regex('a$', 'aba', '0b');
+ test_regex 
+------------
+ {0}
+ {"2 2"}
+(2 rows)
+
+-- expectNomatch	10.5  {&$}	{a$}	a
+select * from test_regex('a$', 'a', '$');
+ test_regex 
+------------
+ {0}
+(1 row)
+
+select * from test_regex('a$', 'a', '$b');
+ test_regex 
+------------
+ {0}
+(1 row)
+
+-- expectIndices	10.6  &N	{$}	ab	{2 1}
+select * from test_regex('$', 'ab', '0N');
+     test_regex      
+---------------------
+ {0,REG_UEMPTYMATCH}
+ {"2 1"}
+(2 rows)
+
+select * from test_regex('$', 'ab', '0Nb');
+     test_regex      
+---------------------
+ {0,REG_UEMPTYMATCH}
+ {"2 1"}
+(2 rows)
+
+-- expectMatch	10.7  &n	^a	a	a
+select * from test_regex('^a', 'a', 'n');
+ test_regex 
+------------
+ {0}
+ {a}
+(2 rows)
+
+select * from test_regex('^a', 'a', 'nb');
+ test_regex 
+------------
+ {0}
+ {a}
+(2 rows)
+
+-- expectMatch	10.8  &n	"^a"	"b\na"	"a"
+select * from test_regex('^a', E'b\na', 'n');
+ test_regex 
+------------
+ {0}
+ {a}
+(2 rows)
+
+select * from test_regex('^a', E'b\na', 'nb');
+ test_regex 
+------------
+ {0}
+ {a}
+(2 rows)
+
+-- expectIndices	10.9  &w	"^a"	"a\na"	{0 0}
+select * from test_regex('^a', E'a\na', '0w');
+ test_regex 
+------------
+ {0}
+ {"0 0"}
+(2 rows)
+
+select * from test_regex('^a', E'a\na', '0wb');
+ test_regex 
+------------
+ {0}
+ {"0 0"}
+(2 rows)
+
+-- expectIndices	10.10 &n^	"^a"	"a\na"	{2 2}
+select * from test_regex('^a', E'a\na', '0n^');
+ test_regex 
+------------
+ {0}
+ {"2 2"}
+(2 rows)
+
+select * from test_regex('^a', E'a\na', '0n^b');
+ test_regex 
+------------
+ {0}
+ {"2 2"}
+(2 rows)
+
+-- expectMatch	10.11 &n	{a$}	a	a
+select * from test_regex('a$', 'a', 'n');
+ test_regex 
+------------
+ {0}
+ {a}
+(2 rows)
+
+select * from test_regex('a$', 'a', 'nb');
+ test_regex 
+------------
+ {0}
+ {a}
+(2 rows)
+
+-- expectMatch	10.12 &n	"a\$"	"a\nb"	"a"
+select * from test_regex('a$', E'a\nb', 'n');
+ test_regex 
+------------
+ {0}
+ {a}
+(2 rows)
+
+select * from test_regex('a$', E'a\nb', 'nb');
+ test_regex 
+------------
+ {0}
+ {a}
+(2 rows)
+
+-- expectIndices	10.13 &n	"a\$"	"a\na"	{0 0}
+select * from test_regex('a$', E'a\na', '0n');
+ test_regex 
+------------
+ {0}
+ {"0 0"}
+(2 rows)
+
+select * from test_regex('a$', E'a\na', '0nb');
+ test_regex 
+------------
+ {0}
+ {"0 0"}
+(2 rows)
+
+-- expectIndices	10.14 N		^^	a	{0 -1}
+select * from test_regex('^^', 'a', '0N');
+     test_regex      
+---------------------
+ {0,REG_UEMPTYMATCH}
+ {"0 -1"}
+(2 rows)
+
+-- expectMatch	10.15 b		^^	^	^
+select * from test_regex('^^', '^', 'b');
+ test_regex 
+------------
+ {0}
+ {^}
+(2 rows)
+
+-- expectIndices	10.16 N		{$$}	a	{1 0}
+select * from test_regex('$$', 'a', '0N');
+     test_regex      
+---------------------
+ {0,REG_UEMPTYMATCH}
+ {"1 0"}
+(2 rows)
+
+-- expectMatch	10.17 b		{$$}	"\$"	"\$"
+select * from test_regex('$$', '$', 'b');
+ test_regex 
+------------
+ {0}
+ {$}
+(2 rows)
+
+-- expectMatch	10.18 &N	{^$}	""	""
+select * from test_regex('^$', '', 'N');
+     test_regex      
+---------------------
+ {0,REG_UEMPTYMATCH}
+ {""}
+(2 rows)
+
+select * from test_regex('^$', '', 'Nb');
+     test_regex      
+---------------------
+ {0,REG_UEMPTYMATCH}
+ {""}
+(2 rows)
+
+-- expectNomatch	10.19 &N	{^$}	a
+select * from test_regex('^$', 'a', 'N');
+     test_regex      
+---------------------
+ {0,REG_UEMPTYMATCH}
+(1 row)
+
+select * from test_regex('^$', 'a', 'Nb');
+     test_regex      
+---------------------
+ {0,REG_UEMPTYMATCH}
+(1 row)
+
+-- expectIndices	10.20 &nN	"^\$"	a\n\nb	{2 1}
+select * from test_regex('^$', E'a\n\nb', '0nN');
+     test_regex      
+---------------------
+ {0,REG_UEMPTYMATCH}
+ {"2 1"}
+(2 rows)
+
+select * from test_regex('^$', E'a\n\nb', '0nNb');
+     test_regex      
+---------------------
+ {0,REG_UEMPTYMATCH}
+ {"2 1"}
+(2 rows)
+
+-- expectMatch	10.21 N		{$^}	""	""
+select * from test_regex('$^', '', 'N');
+     test_regex      
+---------------------
+ {0,REG_UEMPTYMATCH}
+ {""}
+(2 rows)
+
+-- expectMatch	10.22 b		{$^}	"\$^"	"\$^"
+select * from test_regex('$^', '$^', 'b');
+ test_regex 
+------------
+ {0}
+ {$^}
+(2 rows)
+
+-- expectMatch	10.23 P		{\Aa}	a	a
+select * from test_regex('\Aa', 'a', 'P');
+    test_regex     
+-------------------
+ {0,REG_UNONPOSIX}
+ {a}
+(2 rows)
+
+-- expectMatch	10.24 ^P	{\Aa}	a	a
+select * from test_regex('\Aa', 'a', '^P');
+    test_regex     
+-------------------
+ {0,REG_UNONPOSIX}
+ {a}
+(2 rows)
+
+-- expectNomatch	10.25 ^nP	{\Aa}	"b\na"
+select * from test_regex('\Aa', E'b\na', '^nP');
+    test_regex     
+-------------------
+ {0,REG_UNONPOSIX}
+(1 row)
+
+-- expectMatch	10.26 P		{a\Z}	a	a
+select * from test_regex('a\Z', 'a', 'P');
+    test_regex     
+-------------------
+ {0,REG_UNONPOSIX}
+ {a}
+(2 rows)
+
+-- expectMatch	10.27 \$P	{a\Z}	a	a
+select * from test_regex('a\Z', 'a', '$P');
+    test_regex     
+-------------------
+ {0,REG_UNONPOSIX}
+ {a}
+(2 rows)
+
+-- expectNomatch	10.28 \$nP	{a\Z}	"a\nb"
+select * from test_regex('a\Z', E'a\nb', '$nP');
+    test_regex     
+-------------------
+ {0,REG_UNONPOSIX}
+(1 row)
+
+-- expectError	10.29 -		^*	BADRPT
+select * from test_regex('^*', '', '-');
+ERROR:  invalid regular expression: quantifier operand invalid
+-- expectError	10.30 -		{$*}	BADRPT
+select * from test_regex('$*', '', '-');
+ERROR:  invalid regular expression: quantifier operand invalid
+-- expectError	10.31 -		{\A*}	BADRPT
+select * from test_regex('\A*', '', '-');
+ERROR:  invalid regular expression: quantifier operand invalid
+-- expectError	10.32 -		{\Z*}	BADRPT
+select * from test_regex('\Z*', '', '-');
+ERROR:  invalid regular expression: quantifier operand invalid
+-- doing 11 "boundary constraints"
+-- expectMatch	11.1  &LP	{[[:<:]]a}	a	a
+select * from test_regex('[[:<:]]a', 'a', 'LP');
+          test_regex           
+-------------------------------
+ {0,REG_UNONPOSIX,REG_ULOCALE}
+ {a}
+(2 rows)
+
+select * from test_regex('[[:<:]]a', 'a', 'LPb');
+          test_regex           
+-------------------------------
+ {0,REG_UNONPOSIX,REG_ULOCALE}
+ {a}
+(2 rows)
+
+-- expectMatch	11.2  &LP	{[[:<:]]a}	-a	a
+select * from test_regex('[[:<:]]a', '-a', 'LP');
+          test_regex           
+-------------------------------
+ {0,REG_UNONPOSIX,REG_ULOCALE}
+ {a}
+(2 rows)
+
+select * from test_regex('[[:<:]]a', '-a', 'LPb');
+          test_regex           
+-------------------------------
+ {0,REG_UNONPOSIX,REG_ULOCALE}
+ {a}
+(2 rows)
+
+-- expectNomatch	11.3  &LP	{[[:<:]]a}	ba
+select * from test_regex('[[:<:]]a', 'ba', 'LP');
+          test_regex           
+-------------------------------
+ {0,REG_UNONPOSIX,REG_ULOCALE}
+(1 row)
+
+select * from test_regex('[[:<:]]a', 'ba', 'LPb');
+          test_regex           
+-------------------------------
+ {0,REG_UNONPOSIX,REG_ULOCALE}
+(1 row)
+
+-- expectMatch	11.4  &LP	{a[[:>:]]}	a	a
+select * from test_regex('a[[:>:]]', 'a', 'LP');
+          test_regex           
+-------------------------------
+ {0,REG_UNONPOSIX,REG_ULOCALE}
+ {a}
+(2 rows)
+
+select * from test_regex('a[[:>:]]', 'a', 'LPb');
+          test_regex           
+-------------------------------
+ {0,REG_UNONPOSIX,REG_ULOCALE}
+ {a}
+(2 rows)
+
+-- expectMatch	11.5  &LP	{a[[:>:]]}	a-	a
+select * from test_regex('a[[:>:]]', 'a-', 'LP');
+          test_regex           
+-------------------------------
+ {0,REG_UNONPOSIX,REG_ULOCALE}
+ {a}
+(2 rows)
+
+select * from test_regex('a[[:>:]]', 'a-', 'LPb');
+          test_regex           
+-------------------------------
+ {0,REG_UNONPOSIX,REG_ULOCALE}
+ {a}
+(2 rows)
+
+-- expectNomatch	11.6  &LP	{a[[:>:]]}	ab
+select * from test_regex('a[[:>:]]', 'ab', 'LP');
+          test_regex           
+-------------------------------
+ {0,REG_UNONPOSIX,REG_ULOCALE}
+(1 row)
+
+select * from test_regex('a[[:>:]]', 'ab', 'LPb');
+          test_regex           
+-------------------------------
+ {0,REG_UNONPOSIX,REG_ULOCALE}
+(1 row)
+
+-- expectMatch	11.7  bLP	{\<a}		a	a
+select * from test_regex('\<a', 'a', 'bLP');
+          test_regex           
+-------------------------------
+ {0,REG_UNONPOSIX,REG_ULOCALE}
+ {a}
+(2 rows)
+
+-- expectNomatch	11.8  bLP	{\<a}		ba
+select * from test_regex('\<a', 'ba', 'bLP');
+          test_regex           
+-------------------------------
+ {0,REG_UNONPOSIX,REG_ULOCALE}
+(1 row)
+
+-- expectMatch	11.9  bLP	{a\>}		a	a
+select * from test_regex('a\>', 'a', 'bLP');
+          test_regex           
+-------------------------------
+ {0,REG_UNONPOSIX,REG_ULOCALE}
+ {a}
+(2 rows)
+
+-- expectNomatch	11.10 bLP	{a\>}		ab
+select * from test_regex('a\>', 'ab', 'bLP');
+          test_regex           
+-------------------------------
+ {0,REG_UNONPOSIX,REG_ULOCALE}
+(1 row)
+
+-- expectMatch	11.11 LP	{\ya}		a	a
+select * from test_regex('\ya', 'a', 'LP');
+          test_regex           
+-------------------------------
+ {0,REG_UNONPOSIX,REG_ULOCALE}
+ {a}
+(2 rows)
+
+-- expectNomatch	11.12 LP	{\ya}		ba
+select * from test_regex('\ya', 'ba', 'LP');
+          test_regex           
+-------------------------------
+ {0,REG_UNONPOSIX,REG_ULOCALE}
+(1 row)
+
+-- expectMatch	11.13 LP	{a\y}		a	a
+select * from test_regex('a\y', 'a', 'LP');
+          test_regex           
+-------------------------------
+ {0,REG_UNONPOSIX,REG_ULOCALE}
+ {a}
+(2 rows)
+
+-- expectNomatch	11.14 LP	{a\y}		ab
+select * from test_regex('a\y', 'ab', 'LP');
+          test_regex           
+-------------------------------
+ {0,REG_UNONPOSIX,REG_ULOCALE}
+(1 row)
+
+-- expectMatch	11.15 LP	{a\Y}		ab	a
+select * from test_regex('a\Y', 'ab', 'LP');
+          test_regex           
+-------------------------------
+ {0,REG_UNONPOSIX,REG_ULOCALE}
+ {a}
+(2 rows)
+
+-- expectNomatch	11.16 LP	{a\Y}		a-
+select * from test_regex('a\Y', 'a-', 'LP');
+          test_regex           
+-------------------------------
+ {0,REG_UNONPOSIX,REG_ULOCALE}
+(1 row)
+
+-- expectNomatch	11.17 LP	{a\Y}		a
+select * from test_regex('a\Y', 'a', 'LP');
+          test_regex           
+-------------------------------
+ {0,REG_UNONPOSIX,REG_ULOCALE}
+(1 row)
+
+-- expectNomatch	11.18 LP	{-\Y}		-a
+select * from test_regex('-\Y', '-a', 'LP');
+          test_regex           
+-------------------------------
+ {0,REG_UNONPOSIX,REG_ULOCALE}
+(1 row)
+
+-- expectMatch	11.19 LP	{-\Y}		-%	-
+select * from test_regex('-\Y', '-%', 'LP');
+          test_regex           
+-------------------------------
+ {0,REG_UNONPOSIX,REG_ULOCALE}
+ {-}
+(2 rows)
+
+-- expectNomatch	11.20 LP	{\Y-}		a-
+select * from test_regex('\Y-', 'a-', 'LP');
+          test_regex           
+-------------------------------
+ {0,REG_UNONPOSIX,REG_ULOCALE}
+(1 row)
+
+-- expectError	11.21 -		{[[:<:]]*}	BADRPT
+select * from test_regex('[[:<:]]*', '', '-');
+ERROR:  invalid regular expression: quantifier operand invalid
+-- expectError	11.22 -		{[[:>:]]*}	BADRPT
+select * from test_regex('[[:>:]]*', '', '-');
+ERROR:  invalid regular expression: quantifier operand invalid
+-- expectError	11.23 b		{\<*}		BADRPT
+select * from test_regex('\<*', '', 'b');
+ERROR:  invalid regular expression: quantifier operand invalid
+-- expectError	11.24 b		{\>*}		BADRPT
+select * from test_regex('\>*', '', 'b');
+ERROR:  invalid regular expression: quantifier operand invalid
+-- expectError	11.25 -		{\y*}		BADRPT
+select * from test_regex('\y*', '', '-');
+ERROR:  invalid regular expression: quantifier operand invalid
+-- expectError	11.26 -		{\Y*}		BADRPT
+select * from test_regex('\Y*', '', '-');
+ERROR:  invalid regular expression: quantifier operand invalid
+-- expectMatch	11.27 LP	{\ma}		a	a
+select * from test_regex('\ma', 'a', 'LP');
+          test_regex           
+-------------------------------
+ {0,REG_UNONPOSIX,REG_ULOCALE}
+ {a}
+(2 rows)
+
+-- expectNomatch	11.28 LP	{\ma}		ba
+select * from test_regex('\ma', 'ba', 'LP');
+          test_regex           
+-------------------------------
+ {0,REG_UNONPOSIX,REG_ULOCALE}
+(1 row)
+
+-- expectMatch	11.29 LP	{a\M}		a	a
+select * from test_regex('a\M', 'a', 'LP');
+          test_regex           
+-------------------------------
+ {0,REG_UNONPOSIX,REG_ULOCALE}
+ {a}
+(2 rows)
+
+-- expectNomatch	11.30 LP	{a\M}		ab
+select * from test_regex('a\M', 'ab', 'LP');
+          test_regex           
+-------------------------------
+ {0,REG_UNONPOSIX,REG_ULOCALE}
+(1 row)
+
+-- expectNomatch	11.31 ILP	{\Ma}		a
+select * from test_regex('\Ma', 'a', 'ILP');
+                  test_regex                   
+-----------------------------------------------
+ {0,REG_UNONPOSIX,REG_ULOCALE,REG_UIMPOSSIBLE}
+(1 row)
+
+-- expectNomatch	11.32 ILP	{a\m}		a
+select * from test_regex('a\m', 'a', 'ILP');
+                  test_regex                   
+-----------------------------------------------
+ {0,REG_UNONPOSIX,REG_ULOCALE,REG_UIMPOSSIBLE}
+(1 row)
+
+-- doing 12 "character classes"
+-- expectMatch	12.1  LP	{a\db}		a0b	a0b
+select * from test_regex('a\db', 'a0b', 'LP');
+          test_regex           
+-------------------------------
+ {0,REG_UNONPOSIX,REG_ULOCALE}
+ {a0b}
+(2 rows)
+
+-- expectNomatch	12.2  LP	{a\db}		axb
+select * from test_regex('a\db', 'axb', 'LP');
+          test_regex           
+-------------------------------
+ {0,REG_UNONPOSIX,REG_ULOCALE}
+(1 row)
+
+-- expectNomatch	12.3  LP	{a\Db}		a0b
+select * from test_regex('a\Db', 'a0b', 'LP');
+          test_regex           
+-------------------------------
+ {0,REG_UNONPOSIX,REG_ULOCALE}
+(1 row)
+
+-- expectMatch	12.4  LP	{a\Db}		axb	axb
+select * from test_regex('a\Db', 'axb', 'LP');
+          test_regex           
+-------------------------------
+ {0,REG_UNONPOSIX,REG_ULOCALE}
+ {axb}
+(2 rows)
+
+-- expectMatch	12.5  LP	"a\\sb"		"a b"	"a b"
+select * from test_regex('a\sb', 'a b', 'LP');
+          test_regex           
+-------------------------------
+ {0,REG_UNONPOSIX,REG_ULOCALE}
+ {"a b"}
+(2 rows)
+
+-- expectMatch	12.6  LP	"a\\sb"		"a\tb"	"a\tb"
+select * from test_regex('a\sb', E'a\tb', 'LP');
+          test_regex           
+-------------------------------
+ {0,REG_UNONPOSIX,REG_ULOCALE}
+ {"a     b"}
+(2 rows)
+
+-- expectMatch	12.7  LP	"a\\sb"		"a\nb"	"a\nb"
+select * from test_regex('a\sb', E'a\nb', 'LP');
+          test_regex           
+-------------------------------
+ {0,REG_UNONPOSIX,REG_ULOCALE}
+ {"a                          +
+ b"}
+(2 rows)
+
+-- expectNomatch	12.8  LP	{a\sb}		axb
+select * from test_regex('a\sb', 'axb', 'LP');
+          test_regex           
+-------------------------------
+ {0,REG_UNONPOSIX,REG_ULOCALE}
+(1 row)
+
+-- expectMatch	12.9  LP	{a\Sb}		axb	axb
+select * from test_regex('a\Sb', 'axb', 'LP');
+          test_regex           
+-------------------------------
+ {0,REG_UNONPOSIX,REG_ULOCALE}
+ {axb}
+(2 rows)
+
+-- expectNomatch	12.10 LP	"a\\Sb"		"a b"
+select * from test_regex('a\Sb', 'a b', 'LP');
+          test_regex           
+-------------------------------
+ {0,REG_UNONPOSIX,REG_ULOCALE}
+(1 row)
+
+-- expectMatch	12.11 LP	{a\wb}		axb	axb
+select * from test_regex('a\wb', 'axb', 'LP');
+          test_regex           
+-------------------------------
+ {0,REG_UNONPOSIX,REG_ULOCALE}
+ {axb}
+(2 rows)
+
+-- expectNomatch	12.12 LP	{a\wb}		a-b
+select * from test_regex('a\wb', 'a-b', 'LP');
+          test_regex           
+-------------------------------
+ {0,REG_UNONPOSIX,REG_ULOCALE}
+(1 row)
+
+-- expectNomatch	12.13 LP	{a\Wb}		axb
+select * from test_regex('a\Wb', 'axb', 'LP');
+          test_regex           
+-------------------------------
+ {0,REG_UNONPOSIX,REG_ULOCALE}
+(1 row)
+
+-- expectMatch	12.14 LP	{a\Wb}		a-b	a-b
+select * from test_regex('a\Wb', 'a-b', 'LP');
+          test_regex           
+-------------------------------
+ {0,REG_UNONPOSIX,REG_ULOCALE}
+ {a-b}
+(2 rows)
+
+-- expectMatch	12.15 LP	{\y\w+z\y}	adze-guz	guz
+select * from test_regex('\y\w+z\y', 'adze-guz', 'LP');
+          test_regex           
+-------------------------------
+ {0,REG_UNONPOSIX,REG_ULOCALE}
+ {guz}
+(2 rows)
+
+-- expectMatch	12.16 LPE	{a[\d]b}	a1b	a1b
+select * from test_regex('a[\d]b', 'a1b', 'LPE');
+               test_regex               
+----------------------------------------
+ {0,REG_UBBS,REG_UNONPOSIX,REG_ULOCALE}
+ {a1b}
+(2 rows)
+
+-- expectMatch	12.17 LPE	"a\[\\s]b"	"a b"	"a b"
+select * from test_regex('a[\s]b', 'a b', 'LPE');
+               test_regex               
+----------------------------------------
+ {0,REG_UBBS,REG_UNONPOSIX,REG_ULOCALE}
+ {"a b"}
+(2 rows)
+
+-- expectMatch	12.18 LPE	{a[\w]b}	axb	axb
+select * from test_regex('a[\w]b', 'axb', 'LPE');
+               test_regex               
+----------------------------------------
+ {0,REG_UBBS,REG_UNONPOSIX,REG_ULOCALE}
+ {axb}
+(2 rows)
+
+-- doing 13 "escapes"
+-- expectError	13.1  &		"a\\"		EESCAPE
+select * from test_regex('a\', '', '');
+ERROR:  invalid regular expression: invalid escape \ sequence
+select * from test_regex('a\', '', 'b');
+ERROR:  invalid regular expression: invalid escape \ sequence
+-- expectMatch	13.2  -		{a\<b}		a<b	a<b
+select * from test_regex('a\<b', 'a<b', '-');
+ test_regex 
+------------
+ {0}
+ {a<b}
+(2 rows)
+
+-- expectMatch	13.3  e		{a\<b}		a<b	a<b
+select * from test_regex('a\<b', 'a<b', 'e');
+ test_regex 
+------------
+ {0}
+ {a<b}
+(2 rows)
+
+-- expectMatch	13.4  bAS	{a\wb}		awb	awb
+select * from test_regex('a\wb', 'awb', 'bAS');
+          test_regex          
+------------------------------
+ {0,REG_UBSALNUM,REG_UUNSPEC}
+ {awb}
+(2 rows)
+
+-- expectMatch	13.5  eAS	{a\wb}		awb	awb
+select * from test_regex('a\wb', 'awb', 'eAS');
+          test_regex          
+------------------------------
+ {0,REG_UBSALNUM,REG_UUNSPEC}
+ {awb}
+(2 rows)
+
+-- expectMatch	13.6  PL	"a\\ab"		"a\007b"	"a\007b"
+select * from test_regex('a\ab', E'a\007b', 'PL');
+          test_regex           
+-------------------------------
+ {0,REG_UNONPOSIX,REG_ULOCALE}
+ {a\x07b}
+(2 rows)
+
+-- expectMatch	13.7  P		"a\\bb"		"a\bb"	"a\bb"
+select * from test_regex('a\bb', E'a\bb', 'P');
+    test_regex     
+-------------------
+ {0,REG_UNONPOSIX}
+ {a\x08b}
+(2 rows)
+
+-- expectMatch	13.8  P		{a\Bb}		"a\\b"	"a\\b"
+select * from test_regex('a\Bb', 'a\b', 'P');
+    test_regex     
+-------------------
+ {0,REG_UNONPOSIX}
+ {"a\\b"}
+(2 rows)
+
+-- expectMatch	13.9  MP	"a\\chb"	"a\bb"	"a\bb"
+select * from test_regex('a\chb', E'a\bb', 'MP');
+          test_regex           
+-------------------------------
+ {0,REG_UNONPOSIX,REG_UUNPORT}
+ {a\x08b}
+(2 rows)
+
+-- expectMatch	13.10 MP	"a\\cHb"	"a\bb"	"a\bb"
+select * from test_regex('a\cHb', E'a\bb', 'MP');
+          test_regex           
+-------------------------------
+ {0,REG_UNONPOSIX,REG_UUNPORT}
+ {a\x08b}
+(2 rows)
+
+-- expectMatch	13.11 LMP	"a\\e"		"a\033"	"a\033"
+select * from test_regex('a\e', E'a\033', 'LMP');
+                test_regex                 
+-------------------------------------------
+ {0,REG_UNONPOSIX,REG_UUNPORT,REG_ULOCALE}
+ {a\x1B}
+(2 rows)
+
+-- expectMatch	13.12 P		"a\\fb"		"a\fb"	"a\fb"
+select * from test_regex('a\fb', E'a\fb', 'P');
+    test_regex     
+-------------------
+ {0,REG_UNONPOSIX}
+ {"a\x0Cb"}
+(2 rows)
+
+-- expectMatch	13.13 P		"a\\nb"		"a\nb"	"a\nb"
+select * from test_regex('a\nb', E'a\nb', 'P');
+    test_regex     
+-------------------
+ {0,REG_UNONPOSIX}
+ {"a              +
+ b"}
+(2 rows)
+
+-- expectMatch	13.14 P		"a\\rb"		"a\rb"	"a\rb"
+select * from test_regex('a\rb', E'a\rb', 'P');
+    test_regex     
+-------------------
+ {0,REG_UNONPOSIX}
+ {"a\rb"}
+(2 rows)
+
+-- expectMatch	13.15 P		"a\\tb"		"a\tb"	"a\tb"
+select * from test_regex('a\tb', E'a\tb', 'P');
+    test_regex     
+-------------------
+ {0,REG_UNONPOSIX}
+ {"a     b"}
+(2 rows)
+
+-- expectMatch	13.16 P		"a\\u0008x"	"a\bx"	"a\bx"
+select * from test_regex('a\u0008x', E'a\bx', 'P');
+    test_regex     
+-------------------
+ {0,REG_UNONPOSIX}
+ {a\x08x}
+(2 rows)
+
+-- expectMatch	13.17 P		{a\u008x}	"a\bx"	"a\bx"
+-- Tcl has relaxed their code to allow 1-4 hex digits, but Postgres hasn't
+select * from test_regex('a\u008x', E'a\bx', 'P');
+ERROR:  invalid regular expression: invalid escape \ sequence
+-- expectMatch	13.18 P		"a\\u00088x"	"a\b8x"	"a\b8x"
+select * from test_regex('a\u00088x', E'a\b8x', 'P');
+    test_regex     
+-------------------
+ {0,REG_UNONPOSIX}
+ {a\x088x}
+(2 rows)
+
+-- expectMatch	13.19 P		"a\\U00000008x"	"a\bx"	"a\bx"
+select * from test_regex('a\U00000008x', E'a\bx', 'P');
+    test_regex     
+-------------------
+ {0,REG_UNONPOSIX}
+ {a\x08x}
+(2 rows)
+
+-- expectMatch	13.20 P		{a\U0000008x}	"a\bx"	"a\bx"
+-- Tcl has relaxed their code to allow 1-8 hex digits, but Postgres hasn't
+select * from test_regex('a\U0000008x', E'a\bx', 'P');
+ERROR:  invalid regular expression: invalid escape \ sequence
+-- expectMatch	13.21 P		"a\\vb"		"a\vb"	"a\vb"
+select * from test_regex('a\vb', E'a\013b', 'P');
+    test_regex     
+-------------------
+ {0,REG_UNONPOSIX}
+ {"a\x0Bb"}
+(2 rows)
+
+-- expectMatch	13.22 MP	"a\\x08x"	"a\bx"	"a\bx"
+select * from test_regex('a\x08x', E'a\bx', 'MP');
+          test_regex           
+-------------------------------
+ {0,REG_UNONPOSIX,REG_UUNPORT}
+ {a\x08x}
+(2 rows)
+
+-- expectError	13.23 -		{a\xq}		EESCAPE
+select * from test_regex('a\xq', '', '-');
+ERROR:  invalid regular expression: invalid escape \ sequence
+-- expectMatch	13.24 MP	"a\\x08x"	"a\bx"	"a\bx"
+select * from test_regex('a\x08x', E'a\bx', 'MP');
+          test_regex           
+-------------------------------
+ {0,REG_UNONPOSIX,REG_UUNPORT}
+ {a\x08x}
+(2 rows)
+
+-- expectError	13.25 -		{a\z}		EESCAPE
+select * from test_regex('a\z', '', '-');
+ERROR:  invalid regular expression: invalid escape \ sequence
+-- expectMatch	13.26 MP	"a\\010b"	"a\bb"	"a\bb"
+select * from test_regex('a\010b', E'a\bb', 'MP');
+          test_regex           
+-------------------------------
+ {0,REG_UNONPOSIX,REG_UUNPORT}
+ {a\x08b}
+(2 rows)
+
+-- These only work in UTF8 encoding, so they're moved to test_regex_utf8.sql:
+-- expectMatch	13.27 P		"a\\U00001234x"	"a\u1234x"	"a\u1234x"
+-- expectMatch	13.28 P		{a\U00001234x}	"a\u1234x"	"a\u1234x"
+-- expectMatch	13.29 P		"a\\U0001234x"	"a\u1234x"	"a\u1234x"
+-- expectMatch	13.30 P		{a\U0001234x}	"a\u1234x"	"a\u1234x"
+-- expectMatch	13.31 P		"a\\U000012345x"	"a\u12345x"	"a\u12345x"
+-- expectMatch	13.32 P		{a\U000012345x}	"a\u12345x"	"a\u12345x"
+-- expectMatch	13.33 P		"a\\U1000000x"	"a\ufffd0x"	"a\ufffd0x"
+-- expectMatch	13.34 P		{a\U1000000x}	"a\ufffd0x"	"a\ufffd0x"
+-- doing 14 "back references"
+-- # ugh
+-- expectMatch	14.1  RP	{a(b*)c\1}	abbcbb	abbcbb	bb
+select * from test_regex('a(b*)c\1', 'abbcbb', 'RP');
+           test_regex           
+--------------------------------
+ {1,REG_UBACKREF,REG_UNONPOSIX}
+ {abbcbb,bb}
+(2 rows)
+
+-- expectMatch	14.2  RP	{a(b*)c\1}	ac	ac	""
+select * from test_regex('a(b*)c\1', 'ac', 'RP');
+           test_regex           
+--------------------------------
+ {1,REG_UBACKREF,REG_UNONPOSIX}
+ {ac,""}
+(2 rows)
+
+-- expectNomatch	14.3  RP	{a(b*)c\1}	abbcb
+select * from test_regex('a(b*)c\1', 'abbcb', 'RP');
+           test_regex           
+--------------------------------
+ {1,REG_UBACKREF,REG_UNONPOSIX}
+(1 row)
+
+-- expectMatch	14.4  RP	{a(b*)\1}	abbcbb	abb	b
+select * from test_regex('a(b*)\1', 'abbcbb', 'RP');
+           test_regex           
+--------------------------------
+ {1,REG_UBACKREF,REG_UNONPOSIX}
+ {abb,b}
+(2 rows)
+
+-- expectMatch	14.5  RP	{a(b|bb)\1}	abbcbb	abb	b
+select * from test_regex('a(b|bb)\1', 'abbcbb', 'RP');
+           test_regex           
+--------------------------------
+ {1,REG_UBACKREF,REG_UNONPOSIX}
+ {abb,b}
+(2 rows)
+
+-- expectMatch	14.6  RP	{a([bc])\1}	abb	abb	b
+select * from test_regex('a([bc])\1', 'abb', 'RP');
+           test_regex           
+--------------------------------
+ {1,REG_UBACKREF,REG_UNONPOSIX}
+ {abb,b}
+(2 rows)
+
+-- expectNomatch	14.7  RP	{a([bc])\1}	abc
+select * from test_regex('a([bc])\1', 'abc', 'RP');
+           test_regex           
+--------------------------------
+ {1,REG_UBACKREF,REG_UNONPOSIX}
+(1 row)
+
+-- expectMatch	14.8  RP	{a([bc])\1}	abcabb	abb	b
+select * from test_regex('a([bc])\1', 'abcabb', 'RP');
+           test_regex           
+--------------------------------
+ {1,REG_UBACKREF,REG_UNONPOSIX}
+ {abb,b}
+(2 rows)
+
+-- expectNomatch	14.9  RP	{a([bc])*\1}	abc
+select * from test_regex('a([bc])*\1', 'abc', 'RP');
+           test_regex           
+--------------------------------
+ {1,REG_UBACKREF,REG_UNONPOSIX}
+(1 row)
+
+-- expectNomatch	14.10 RP	{a([bc])\1}	abB
+select * from test_regex('a([bc])\1', 'abB', 'RP');
+           test_regex           
+--------------------------------
+ {1,REG_UBACKREF,REG_UNONPOSIX}
+(1 row)
+
+-- expectMatch	14.11 iRP	{a([bc])\1}	abB	abB	b
+select * from test_regex('a([bc])\1', 'abB', 'iRP');
+           test_regex           
+--------------------------------
+ {1,REG_UBACKREF,REG_UNONPOSIX}
+ {abB,b}
+(2 rows)
+
+-- expectMatch	14.12 RP	{a([bc])\1+}	abbb	abbb	b
+select * from test_regex('a([bc])\1+', 'abbb', 'RP');
+           test_regex           
+--------------------------------
+ {1,REG_UBACKREF,REG_UNONPOSIX}
+ {abbb,b}
+(2 rows)
+
+-- expectMatch	14.13 QRP	"a(\[bc])\\1{3,4}"	abbbb	abbbb	b
+select * from test_regex('a([bc])\1{3,4}', 'abbbb', 'QRP');
+                 test_regex                 
+--------------------------------------------
+ {1,REG_UBACKREF,REG_UBOUNDS,REG_UNONPOSIX}
+ {abbbb,b}
+(2 rows)
+
+-- expectNomatch	14.14 QRP	"a(\[bc])\\1{3,4}"	abbb
+select * from test_regex('a([bc])\1{3,4}', 'abbb', 'QRP');
+                 test_regex                 
+--------------------------------------------
+ {1,REG_UBACKREF,REG_UBOUNDS,REG_UNONPOSIX}
+(1 row)
+
+-- expectMatch	14.15 RP	{a([bc])\1*}	abbb	abbb	b
+select * from test_regex('a([bc])\1*', 'abbb', 'RP');
+           test_regex           
+--------------------------------
+ {1,REG_UBACKREF,REG_UNONPOSIX}
+ {abbb,b}
+(2 rows)
+
+-- expectMatch	14.16 RP	{a([bc])\1*}	ab	ab	b
+select * from test_regex('a([bc])\1*', 'ab', 'RP');
+           test_regex           
+--------------------------------
+ {1,REG_UBACKREF,REG_UNONPOSIX}
+ {ab,b}
+(2 rows)
+
+-- expectMatch	14.17 RP	{a([bc])(\1*)}	ab	ab	b	""
+select * from test_regex('a([bc])(\1*)', 'ab', 'RP');
+           test_regex           
+--------------------------------
+ {2,REG_UBACKREF,REG_UNONPOSIX}
+ {ab,b,""}
+(2 rows)
+
+-- expectError	14.18 -		{a((b)\1)}	ESUBREG
+select * from test_regex('a((b)\1)', '', '-');
+ERROR:  invalid regular expression: invalid backreference number
+-- expectError	14.19 -		{a(b)c\2}	ESUBREG
+select * from test_regex('a(b)c\2', '', '-');
+ERROR:  invalid regular expression: invalid backreference number
+-- expectMatch	14.20 bR	{a\(b*\)c\1}	abbcbb	abbcbb	bb
+select * from test_regex('a\(b*\)c\1', 'abbcbb', 'bR');
+    test_regex    
+------------------
+ {1,REG_UBACKREF}
+ {abbcbb,bb}
+(2 rows)
+
+-- expectMatch	14.21 RP	{^([bc])\1*$}	bbb	bbb	b
+select * from test_regex('^([bc])\1*$', 'bbb', 'RP');
+           test_regex           
+--------------------------------
+ {1,REG_UBACKREF,REG_UNONPOSIX}
+ {bbb,b}
+(2 rows)
+
+-- expectMatch	14.22 RP	{^([bc])\1*$}	ccc	ccc	c
+select * from test_regex('^([bc])\1*$', 'ccc', 'RP');
+           test_regex           
+--------------------------------
+ {1,REG_UBACKREF,REG_UNONPOSIX}
+ {ccc,c}
+(2 rows)
+
+-- expectNomatch	14.23 RP	{^([bc])\1*$}	bcb
+select * from test_regex('^([bc])\1*$', 'bcb', 'RP');
+           test_regex           
+--------------------------------
+ {1,REG_UBACKREF,REG_UNONPOSIX}
+(1 row)
+
+-- expectMatch	14.24 LRP	{^(\w+)( \1)+$}	{abc abc abc} {abc abc abc} abc { abc}
+select * from test_regex('^(\w+)( \1)+$', 'abc abc abc', 'LRP');
+                 test_regex                 
+--------------------------------------------
+ {2,REG_UBACKREF,REG_UNONPOSIX,REG_ULOCALE}
+ {"abc abc abc",abc," abc"}
+(2 rows)
+
+-- expectNomatch	14.25 LRP	{^(\w+)( \1)+$}	{abc abd abc}
+select * from test_regex('^(\w+)( \1)+$', 'abc abd abc', 'LRP');
+                 test_regex                 
+--------------------------------------------
+ {2,REG_UBACKREF,REG_UNONPOSIX,REG_ULOCALE}
+(1 row)
+
+-- expectNomatch	14.26 LRP	{^(\w+)( \1)+$}	{abc abc abd}
+select * from test_regex('^(\w+)( \1)+$', 'abc abc abd', 'LRP');
+                 test_regex                 
+--------------------------------------------
+ {2,REG_UBACKREF,REG_UNONPOSIX,REG_ULOCALE}
+(1 row)
+
+-- expectMatch	14.27 RP	{^(.+)( \1)+$}	{abc abc abc} {abc abc abc} abc { abc}
+select * from test_regex('^(.+)( \1)+$', 'abc abc abc', 'RP');
+           test_regex           
+--------------------------------
+ {2,REG_UBACKREF,REG_UNONPOSIX}
+ {"abc abc abc",abc," abc"}
+(2 rows)
+
+-- expectNomatch	14.28 RP	{^(.+)( \1)+$}	{abc abd abc}
+select * from test_regex('^(.+)( \1)+$', 'abc abd abc', 'RP');
+           test_regex           
+--------------------------------
+ {2,REG_UBACKREF,REG_UNONPOSIX}
+(1 row)
+
+-- expectNomatch	14.29 RP	{^(.+)( \1)+$}	{abc abc abd}
+select * from test_regex('^(.+)( \1)+$', 'abc abc abd', 'RP');
+           test_regex           
+--------------------------------
+ {2,REG_UBACKREF,REG_UNONPOSIX}
+(1 row)
+
+-- doing 15 "octal escapes vs back references"
+-- # initial zero is always octal
+-- expectMatch	15.1  MP	"a\\010b"	"a\bb"	"a\bb"
+select * from test_regex('a\010b', E'a\bb', 'MP');
+          test_regex           
+-------------------------------
+ {0,REG_UNONPOSIX,REG_UUNPORT}
+ {a\x08b}
+(2 rows)
+
+-- expectMatch	15.2  MP	"a\\0070b"	"a\0070b"	"a\0070b"
+select * from test_regex('a\0070b', E'a\0070b', 'MP');
+          test_regex           
+-------------------------------
+ {0,REG_UNONPOSIX,REG_UUNPORT}
+ {a\x070b}
+(2 rows)
+
+-- expectMatch	15.3  MP	"a\\07b"	"a\007b"	"a\007b"
+select * from test_regex('a\07b', E'a\007b', 'MP');
+          test_regex           
+-------------------------------
+ {0,REG_UNONPOSIX,REG_UUNPORT}
+ {a\x07b}
+(2 rows)
+
+-- expectMatch	15.4  MP	"a(b)(b)(b)(b)(b)(b)(b)(b)(b)(b)\\07c" \
+-- 	"abbbbbbbbbb\007c" abbbbbbbbbb\007c b b b b b b b b b b
+select * from test_regex('a(b)(b)(b)(b)(b)(b)(b)(b)(b)(b)\07c', E'abbbbbbbbbb\007c', 'MP');
+               test_regex               
+----------------------------------------
+ {10,REG_UNONPOSIX,REG_UUNPORT}
+ {abbbbbbbbbb\x07c,b,b,b,b,b,b,b,b,b,b}
+(2 rows)
+
+-- # a single digit is always a backref
+-- expectError	15.5  -		{a\7b}	ESUBREG
+select * from test_regex('a\7b', '', '-');
+ERROR:  invalid regular expression: invalid backreference number
+-- # otherwise it's a backref only if within range (barf!)
+-- expectMatch	15.6  MP	"a\\10b"	"a\bb"	"a\bb"
+select * from test_regex('a\10b', E'a\bb', 'MP');
+          test_regex           
+-------------------------------
+ {0,REG_UNONPOSIX,REG_UUNPORT}
+ {a\x08b}
+(2 rows)
+
+-- expectMatch	15.7  MP	{a\101b}	aAb	aAb
+select * from test_regex('a\101b', 'aAb', 'MP');
+          test_regex           
+-------------------------------
+ {0,REG_UNONPOSIX,REG_UUNPORT}
+ {aAb}
+(2 rows)
+
+-- expectMatch	15.8  RP	{a(b)(b)(b)(b)(b)(b)(b)(b)(b)(b)\10c} \
+-- 	"abbbbbbbbbbbc" abbbbbbbbbbbc b b b b b b b b b b
+select * from test_regex('a(b)(b)(b)(b)(b)(b)(b)(b)(b)(b)\10c', 'abbbbbbbbbbbc', 'RP');
+             test_regex              
+-------------------------------------
+ {10,REG_UBACKREF,REG_UNONPOSIX}
+ {abbbbbbbbbbbc,b,b,b,b,b,b,b,b,b,b}
+(2 rows)
+
+-- # but we're fussy about border cases -- guys who want octal should use the zero
+-- expectError	15.9  -	{a((((((((((b\10))))))))))c}	ESUBREG
+select * from test_regex('a((((((((((b\10))))))))))c', '', '-');
+ERROR:  invalid regular expression: invalid backreference number
+-- # BREs don't have octal, EREs don't have backrefs
+-- expectMatch	15.10 MP	"a\\12b"	"a\nb"	"a\nb"
+select * from test_regex('a\12b', E'a\nb', 'MP');
+          test_regex           
+-------------------------------
+ {0,REG_UNONPOSIX,REG_UUNPORT}
+ {"a                          +
+ b"}
+(2 rows)
+
+-- expectError	15.11 b		{a\12b}		ESUBREG
+select * from test_regex('a\12b', '', 'b');
+ERROR:  invalid regular expression: invalid backreference number
+-- expectMatch	15.12 eAS	{a\12b}		a12b	a12b
+select * from test_regex('a\12b', 'a12b', 'eAS');
+          test_regex          
+------------------------------
+ {0,REG_UBSALNUM,REG_UUNSPEC}
+ {a12b}
+(2 rows)
+
+-- expectMatch	15.13 MP	{a\701b}	a\u00381b	a\u00381b
+select * from test_regex('a\701b', 'a81b', 'MP');
+          test_regex           
+-------------------------------
+ {0,REG_UNONPOSIX,REG_UUNPORT}
+ {a81b}
+(2 rows)
+
+-- doing 16 "expanded syntax"
+-- expectMatch	16.1 xP		"a b c"		"abc"	"abc"
+select * from test_regex('a b c', 'abc', 'xP');
+    test_regex     
+-------------------
+ {0,REG_UNONPOSIX}
+ {abc}
+(2 rows)
+
+-- expectMatch	16.2 xP		"a b #oops\nc\td"	"abcd"	"abcd"
+select * from test_regex(E'a b #oops\nc\td', 'abcd', 'xP');
+    test_regex     
+-------------------
+ {0,REG_UNONPOSIX}
+ {abcd}
+(2 rows)
+
+-- expectMatch	16.3 x		"a\\ b\\\tc"	"a b\tc"	"a b\tc"
+select * from test_regex(E'a\\ b\\\tc', E'a b\tc', 'x');
+ test_regex  
+-------------
+ {0}
+ {"a b   c"}
+(2 rows)
+
+-- expectMatch	16.4 xP		"a b\\#c"	"ab#c"	"ab#c"
+select * from test_regex('a b\#c', 'ab#c', 'xP');
+    test_regex     
+-------------------
+ {0,REG_UNONPOSIX}
+ {ab#c}
+(2 rows)
+
+-- expectMatch	16.5 xP		"a b\[c d]e"	"ab e"	"ab e"
+select * from test_regex('a b[c d]e', 'ab e', 'xP');
+    test_regex     
+-------------------
+ {0,REG_UNONPOSIX}
+ {"ab e"}
+(2 rows)
+
+-- expectMatch	16.6 xP		"a b\[c#d]e"	"ab#e"	"ab#e"
+select * from test_regex('a b[c#d]e', 'ab#e', 'xP');
+    test_regex     
+-------------------
+ {0,REG_UNONPOSIX}
+ {ab#e}
+(2 rows)
+
+-- expectMatch	16.7 xP		"a b\[c#d]e"	"abde"	"abde"
+select * from test_regex('a b[c#d]e', 'abde', 'xP');
+    test_regex     
+-------------------
+ {0,REG_UNONPOSIX}
+ {abde}
+(2 rows)
+
+-- expectMatch	16.8 xSPB	"ab{ d"		"ab\{d"	"ab\{d"
+select * from test_regex('ab{ d', 'ab{d', 'xSPB');
+                test_regex                 
+-------------------------------------------
+ {0,REG_UBRACES,REG_UNONPOSIX,REG_UUNSPEC}
+ {"ab{d"}
+(2 rows)
+
+-- expectMatch	16.9 xPQ	"ab{ 1 , 2 }c"	"abc"	"abc"
+select * from test_regex('ab{ 1 , 2 }c', 'abc', 'xPQ');
+          test_regex           
+-------------------------------
+ {0,REG_UBOUNDS,REG_UNONPOSIX}
+ {abc}
+(2 rows)
+
+-- doing 17 "misc syntax"
+-- expectMatch	17.1 P	a(?#comment)b	ab	ab
+select * from test_regex('a(?#comment)b', 'ab', 'P');
+    test_regex     
+-------------------
+ {0,REG_UNONPOSIX}
+ {ab}
+(2 rows)
+
+-- doing 18 "unmatchable REs"
+-- expectNomatch	18.1 I	a^b		ab
+select * from test_regex('a^b', 'ab', 'I');
+     test_regex      
+---------------------
+ {0,REG_UIMPOSSIBLE}
+(1 row)
+
+-- doing 19 "case independence"
+-- expectMatch	19.1 &i		ab		Ab	Ab
+select * from test_regex('ab', 'Ab', 'i');
+ test_regex 
+------------
+ {0}
+ {Ab}
+(2 rows)
+
+select * from test_regex('ab', 'Ab', 'ib');
+ test_regex 
+------------
+ {0}
+ {Ab}
+(2 rows)
+
+-- expectMatch	19.2 &i		{a[bc]}		aC	aC
+select * from test_regex('a[bc]', 'aC', 'i');
+ test_regex 
+------------
+ {0}
+ {aC}
+(2 rows)
+
+select * from test_regex('a[bc]', 'aC', 'ib');
+ test_regex 
+------------
+ {0}
+ {aC}
+(2 rows)
+
+-- expectNomatch	19.3 &i		{a[^bc]}	aB
+select * from test_regex('a[^bc]', 'aB', 'i');
+ test_regex 
+------------
+ {0}
+(1 row)
+
+select * from test_regex('a[^bc]', 'aB', 'ib');
+ test_regex 
+------------
+ {0}
+(1 row)
+
+-- expectMatch	19.4 &iM	{a[b-d]}	aC	aC
+select * from test_regex('a[b-d]', 'aC', 'iM');
+   test_regex    
+-----------------
+ {0,REG_UUNPORT}
+ {aC}
+(2 rows)
+
+select * from test_regex('a[b-d]', 'aC', 'iMb');
+   test_regex    
+-----------------
+ {0,REG_UUNPORT}
+ {aC}
+(2 rows)
+
+-- expectNomatch	19.5 &iM	{a[^b-d]}	aC
+select * from test_regex('a[^b-d]', 'aC', 'iM');
+   test_regex    
+-----------------
+ {0,REG_UUNPORT}
+(1 row)
+
+select * from test_regex('a[^b-d]', 'aC', 'iMb');
+   test_regex    
+-----------------
+ {0,REG_UUNPORT}
+(1 row)
+
+-- doing 20 "directors and embedded options"
+-- expectError	20.1  &		***?		BADPAT
+select * from test_regex('***?', '', '');
+ERROR:  invalid regular expression: invalid regexp (reg version 0.8)
+select * from test_regex('***?', '', 'b');
+ERROR:  invalid regular expression: invalid regexp (reg version 0.8)
+-- expectMatch	20.2  q		***?		***?	***?
+select * from test_regex('***?', '***?', 'q');
+ test_regex 
+------------
+ {0}
+ {***?}
+(2 rows)
+
+-- expectMatch	20.3  &P	***=a*b		a*b	a*b
+select * from test_regex('***=a*b', 'a*b', 'P');
+    test_regex     
+-------------------
+ {0,REG_UNONPOSIX}
+ {a*b}
+(2 rows)
+
+select * from test_regex('***=a*b', 'a*b', 'Pb');
+    test_regex     
+-------------------
+ {0,REG_UNONPOSIX}
+ {a*b}
+(2 rows)
+
+-- expectMatch	20.4  q		***=a*b		***=a*b	***=a*b
+select * from test_regex('***=a*b', '***=a*b', 'q');
+ test_regex 
+------------
+ {0}
+ {***=a*b}
+(2 rows)
+
+-- expectMatch	20.5  bLP	{***:\w+}	ab	ab
+select * from test_regex('***:\w+', 'ab', 'bLP');
+          test_regex           
+-------------------------------
+ {0,REG_UNONPOSIX,REG_ULOCALE}
+ {ab}
+(2 rows)
+
+-- expectMatch	20.6  eLP	{***:\w+}	ab	ab
+select * from test_regex('***:\w+', 'ab', 'eLP');
+          test_regex           
+-------------------------------
+ {0,REG_UNONPOSIX,REG_ULOCALE}
+ {ab}
+(2 rows)
+
+-- expectError	20.7  &		***:***=a*b	BADRPT
+select * from test_regex('***:***=a*b', '', '');
+ERROR:  invalid regular expression: quantifier operand invalid
+select * from test_regex('***:***=a*b', '', 'b');
+ERROR:  invalid regular expression: quantifier operand invalid
+-- expectMatch	20.8  &P	***:(?b)a+b	a+b	a+b
+select * from test_regex('***:(?b)a+b', 'a+b', 'P');
+    test_regex     
+-------------------
+ {0,REG_UNONPOSIX}
+ {a+b}
+(2 rows)
+
+select * from test_regex('***:(?b)a+b', 'a+b', 'Pb');
+    test_regex     
+-------------------
+ {0,REG_UNONPOSIX}
+ {a+b}
+(2 rows)
+
+-- expectMatch	20.9  P		(?b)a+b		a+b	a+b
+select * from test_regex('(?b)a+b', 'a+b', 'P');
+    test_regex     
+-------------------
+ {0,REG_UNONPOSIX}
+ {a+b}
+(2 rows)
+
+-- expectError	20.10 e		{(?b)\w+}	BADRPT
+select * from test_regex('(?b)\w+', '', 'e');
+ERROR:  invalid regular expression: quantifier operand invalid
+-- expectMatch	20.11 bAS	{(?b)\w+}	(?b)w+	(?b)w+
+select * from test_regex('(?b)\w+', '(?b)w+', 'bAS');
+          test_regex          
+------------------------------
+ {0,REG_UBSALNUM,REG_UUNSPEC}
+ {(?b)w+}
+(2 rows)
+
+-- expectMatch	20.12 iP	(?c)a		a	a
+select * from test_regex('(?c)a', 'a', 'iP');
+    test_regex     
+-------------------
+ {0,REG_UNONPOSIX}
+ {a}
+(2 rows)
+
+-- expectNomatch	20.13 iP	(?c)a		A
+select * from test_regex('(?c)a', 'A', 'iP');
+    test_regex     
+-------------------
+ {0,REG_UNONPOSIX}
+(1 row)
+
+-- expectMatch	20.14 APS	{(?e)\W+}	WW	WW
+select * from test_regex('(?e)\W+', 'WW', 'APS');
+                 test_regex                 
+--------------------------------------------
+ {0,REG_UBSALNUM,REG_UNONPOSIX,REG_UUNSPEC}
+ {WW}
+(2 rows)
+
+-- expectMatch	20.15 P		(?i)a+		Aa	Aa
+select * from test_regex('(?i)a+', 'Aa', 'P');
+    test_regex     
+-------------------
+ {0,REG_UNONPOSIX}
+ {Aa}
+(2 rows)
+
+-- expectNomatch	20.16 P		"(?m)a.b"	"a\nb"
+select * from test_regex('(?m)a.b', E'a\nb', 'P');
+    test_regex     
+-------------------
+ {0,REG_UNONPOSIX}
+(1 row)
+
+-- expectMatch	20.17 P		"(?m)^b"	"a\nb"	"b"
+select * from test_regex('(?m)^b', E'a\nb', 'P');
+    test_regex     
+-------------------
+ {0,REG_UNONPOSIX}
+ {b}
+(2 rows)
+
+-- expectNomatch	20.18 P		"(?n)a.b"	"a\nb"
+select * from test_regex('(?n)a.b', E'a\nb', 'P');
+    test_regex     
+-------------------
+ {0,REG_UNONPOSIX}
+(1 row)
+
+-- expectMatch	20.19 P		"(?n)^b"	"a\nb"	"b"
+select * from test_regex('(?n)^b', E'a\nb', 'P');
+    test_regex     
+-------------------
+ {0,REG_UNONPOSIX}
+ {b}
+(2 rows)
+
+-- expectNomatch	20.20 P		"(?p)a.b"	"a\nb"
+select * from test_regex('(?p)a.b', E'a\nb', 'P');
+    test_regex     
+-------------------
+ {0,REG_UNONPOSIX}
+(1 row)
+
+-- expectNomatch	20.21 P		"(?p)^b"	"a\nb"
+select * from test_regex('(?p)^b', E'a\nb', 'P');
+    test_regex     
+-------------------
+ {0,REG_UNONPOSIX}
+(1 row)
+
+-- expectMatch	20.22 P		(?q)a+b		a+b	a+b
+select * from test_regex('(?q)a+b', 'a+b', 'P');
+    test_regex     
+-------------------
+ {0,REG_UNONPOSIX}
+ {a+b}
+(2 rows)
+
+-- expectMatch	20.23 nP	"(?s)a.b"	"a\nb"	"a\nb"
+select * from test_regex('(?s)a.b', E'a\nb', 'nP');
+    test_regex     
+-------------------
+ {0,REG_UNONPOSIX}
+ {"a              +
+ b"}
+(2 rows)
+
+-- expectMatch	20.24 xP	"(?t)a b"	"a b"	"a b"
+select * from test_regex('(?t)a b', 'a b', 'xP');
+    test_regex     
+-------------------
+ {0,REG_UNONPOSIX}
+ {"a b"}
+(2 rows)
+
+-- expectMatch	20.25 P		"(?w)a.b"	"a\nb"	"a\nb"
+select * from test_regex('(?w)a.b', E'a\nb', 'P');
+    test_regex     
+-------------------
+ {0,REG_UNONPOSIX}
+ {"a              +
+ b"}
+(2 rows)
+
+-- expectMatch	20.26 P		"(?w)^b"	"a\nb"	"b"
+select * from test_regex('(?w)^b', E'a\nb', 'P');
+    test_regex     
+-------------------
+ {0,REG_UNONPOSIX}
+ {b}
+(2 rows)
+
+-- expectMatch	20.27 P		"(?x)a b"	"ab"	"ab"
+select * from test_regex('(?x)a b', 'ab', 'P');
+    test_regex     
+-------------------
+ {0,REG_UNONPOSIX}
+ {ab}
+(2 rows)
+
+-- expectError	20.28 -		(?z)ab		BADOPT
+select * from test_regex('(?z)ab', '', '-');
+ERROR:  invalid regular expression: invalid embedded option
+-- expectMatch	20.29 P		(?ici)a+	Aa	Aa
+select * from test_regex('(?ici)a+', 'Aa', 'P');
+    test_regex     
+-------------------
+ {0,REG_UNONPOSIX}
+ {Aa}
+(2 rows)
+
+-- expectError	20.30 P		(?i)(?q)a+	BADRPT
+select * from test_regex('(?i)(?q)a+', '', 'P');
+ERROR:  invalid regular expression: quantifier operand invalid
+-- expectMatch	20.31 P		(?q)(?i)a+	(?i)a+	(?i)a+
+select * from test_regex('(?q)(?i)a+', '(?i)a+', 'P');
+    test_regex     
+-------------------
+ {0,REG_UNONPOSIX}
+ {(?i)a+}
+(2 rows)
+
+-- expectMatch	20.32 P		(?qe)a+		a	a
+select * from test_regex('(?qe)a+', 'a', 'P');
+    test_regex     
+-------------------
+ {0,REG_UNONPOSIX}
+ {a}
+(2 rows)
+
+-- expectMatch	20.33 xP	"(?q)a b"	"a b"	"a b"
+select * from test_regex('(?q)a b', 'a b', 'xP');
+    test_regex     
+-------------------
+ {0,REG_UNONPOSIX}
+ {"a b"}
+(2 rows)
+
+-- expectMatch	20.34 P		"(?qx)a b"	"a b"	"a b"
+select * from test_regex('(?qx)a b', 'a b', 'P');
+    test_regex     
+-------------------
+ {0,REG_UNONPOSIX}
+ {"a b"}
+(2 rows)
+
+-- expectMatch	20.35 P		(?qi)ab		Ab	Ab
+select * from test_regex('(?qi)ab', 'Ab', 'P');
+    test_regex     
+-------------------
+ {0,REG_UNONPOSIX}
+ {Ab}
+(2 rows)
+
+-- doing 21 "capturing"
+-- expectMatch	21.1  -		a(b)c		abc	abc	b
+select * from test_regex('a(b)c', 'abc', '-');
+ test_regex 
+------------
+ {1}
+ {abc,b}
+(2 rows)
+
+-- expectMatch	21.2  P		a(?:b)c		xabc	abc
+select * from test_regex('a(?:b)c', 'xabc', 'P');
+    test_regex     
+-------------------
+ {0,REG_UNONPOSIX}
+ {abc}
+(2 rows)
+
+-- expectMatch	21.3  -		a((b))c		xabcy	abc	b	b
+select * from test_regex('a((b))c', 'xabcy', '-');
+ test_regex 
+------------
+ {2}
+ {abc,b,b}
+(2 rows)
+
+-- expectMatch	21.4  P		a(?:(b))c	abcy	abc	b
+select * from test_regex('a(?:(b))c', 'abcy', 'P');
+    test_regex     
+-------------------
+ {1,REG_UNONPOSIX}
+ {abc,b}
+(2 rows)
+
+-- expectMatch	21.5  P		a((?:b))c	abc	abc	b
+select * from test_regex('a((?:b))c', 'abc', 'P');
+    test_regex     
+-------------------
+ {1,REG_UNONPOSIX}
+ {abc,b}
+(2 rows)
+
+-- expectMatch	21.6  P		a(?:(?:b))c	abc	abc
+select * from test_regex('a(?:(?:b))c', 'abc', 'P');
+    test_regex     
+-------------------
+ {0,REG_UNONPOSIX}
+ {abc}
+(2 rows)
+
+-- expectIndices	21.7  Q		"a(b){0}c"	ac	{0 1}	{-1 -1}
+select * from test_regex('a(b){0}c', 'ac', '0Q');
+   test_regex    
+-----------------
+ {1,REG_UBOUNDS}
+ {"0 1","-1 -1"}
+(2 rows)
+
+-- expectMatch	21.8  -		a(b)c(d)e	abcde	abcde	b	d
+select * from test_regex('a(b)c(d)e', 'abcde', '-');
+ test_regex  
+-------------
+ {2}
+ {abcde,b,d}
+(2 rows)
+
+-- expectMatch	21.9  -		(b)c(d)e	bcde	bcde	b	d
+select * from test_regex('(b)c(d)e', 'bcde', '-');
+ test_regex 
+------------
+ {2}
+ {bcde,b,d}
+(2 rows)
+
+-- expectMatch	21.10 -		a(b)(d)e	abde	abde	b	d
+select * from test_regex('a(b)(d)e', 'abde', '-');
+ test_regex 
+------------
+ {2}
+ {abde,b,d}
+(2 rows)
+
+-- expectMatch	21.11 -		a(b)c(d)	abcd	abcd	b	d
+select * from test_regex('a(b)c(d)', 'abcd', '-');
+ test_regex 
+------------
+ {2}
+ {abcd,b,d}
+(2 rows)
+
+-- expectMatch	21.12 -		(ab)(cd)	xabcdy	abcd	ab	cd
+select * from test_regex('(ab)(cd)', 'xabcdy', '-');
+  test_regex  
+--------------
+ {2}
+ {abcd,ab,cd}
+(2 rows)
+
+-- expectMatch	21.13 -		a(b)?c		xabcy	abc	b
+select * from test_regex('a(b)?c', 'xabcy', '-');
+ test_regex 
+------------
+ {1}
+ {abc,b}
+(2 rows)
+
+-- expectIndices	21.14 -		a(b)?c		xacy	{1 2}	{-1 -1}
+select * from test_regex('a(b)?c', 'xacy', '0-');
+   test_regex    
+-----------------
+ {1}
+ {"1 2","-1 -1"}
+(2 rows)
+
+-- expectMatch	21.15 -		a(b)?c(d)?e	xabcdey	abcde	b	d
+select * from test_regex('a(b)?c(d)?e', 'xabcdey', '-');
+ test_regex  
+-------------
+ {2}
+ {abcde,b,d}
+(2 rows)
+
+-- expectIndices	21.16 -		a(b)?c(d)?e	xacdey	{1 4}	{-1 -1}	{3 3}
+select * from test_regex('a(b)?c(d)?e', 'xacdey', '0-');
+      test_regex       
+-----------------------
+ {2}
+ {"1 4","-1 -1","3 3"}
+(2 rows)
+
+-- expectIndices	21.17 -		a(b)?c(d)?e	xabcey	{1 4}	{2 2}	{-1 -1}
+select * from test_regex('a(b)?c(d)?e', 'xabcey', '0-');
+      test_regex       
+-----------------------
+ {2}
+ {"1 4","2 2","-1 -1"}
+(2 rows)
+
+-- expectIndices	21.18 -		a(b)?c(d)?e	xacey	{1 3}	{-1 -1}	{-1 -1}
+select * from test_regex('a(b)?c(d)?e', 'xacey', '0-');
+       test_regex        
+-------------------------
+ {2}
+ {"1 3","-1 -1","-1 -1"}
+(2 rows)
+
+-- expectMatch	21.19 -		a(b)*c		xabcy	abc	b
+select * from test_regex('a(b)*c', 'xabcy', '-');
+ test_regex 
+------------
+ {1}
+ {abc,b}
+(2 rows)
+
+-- expectIndices	21.20 -		a(b)*c		xabbbcy	{1 5}	{4 4}
+select * from test_regex('a(b)*c', 'xabbbcy', '0-');
+  test_regex   
+---------------
+ {1}
+ {"1 5","4 4"}
+(2 rows)
+
+-- expectIndices	21.21 -		a(b)*c		xacy	{1 2}	{-1 -1}
+select * from test_regex('a(b)*c', 'xacy', '0-');
+   test_regex    
+-----------------
+ {1}
+ {"1 2","-1 -1"}
+(2 rows)
+
+-- expectMatch	21.22 -		a(b*)c		xabbbcy	abbbc	bbb
+select * from test_regex('a(b*)c', 'xabbbcy', '-');
+ test_regex  
+-------------
+ {1}
+ {abbbc,bbb}
+(2 rows)
+
+-- expectMatch	21.23 -		a(b*)c		xacy	ac	""
+select * from test_regex('a(b*)c', 'xacy', '-');
+ test_regex 
+------------
+ {1}
+ {ac,""}
+(2 rows)
+
+-- expectNomatch	21.24 -		a(b)+c		xacy
+select * from test_regex('a(b)+c', 'xacy', '-');
+ test_regex 
+------------
+ {1}
+(1 row)
+
+-- expectMatch	21.25 -		a(b)+c		xabcy	abc	b
+select * from test_regex('a(b)+c', 'xabcy', '-');
+ test_regex 
+------------
+ {1}
+ {abc,b}
+(2 rows)
+
+-- expectIndices	21.26 -		a(b)+c		xabbbcy	{1 5}	{4 4}
+select * from test_regex('a(b)+c', 'xabbbcy', '0-');
+  test_regex   
+---------------
+ {1}
+ {"1 5","4 4"}
+(2 rows)
+
+-- expectMatch	21.27 -		a(b+)c		xabbbcy	abbbc	bbb
+select * from test_regex('a(b+)c', 'xabbbcy', '-');
+ test_regex  
+-------------
+ {1}
+ {abbbc,bbb}
+(2 rows)
+
+-- expectIndices	21.28 Q		"a(b){2,3}c"	xabbbcy	{1 5}	{4 4}
+select * from test_regex('a(b){2,3}c', 'xabbbcy', '0Q');
+   test_regex    
+-----------------
+ {1,REG_UBOUNDS}
+ {"1 5","4 4"}
+(2 rows)
+
+-- expectIndices	21.29 Q		"a(b){2,3}c"	xabbcy	{1 4}	{3 3}
+select * from test_regex('a(b){2,3}c', 'xabbcy', '0Q');
+   test_regex    
+-----------------
+ {1,REG_UBOUNDS}
+ {"1 4","3 3"}
+(2 rows)
+
+-- expectNomatch	21.30 Q		"a(b){2,3}c"	xabcy
+select * from test_regex('a(b){2,3}c', 'xabcy', 'Q');
+   test_regex    
+-----------------
+ {1,REG_UBOUNDS}
+(1 row)
+
+-- expectMatch	21.31 LP	"\\y(\\w+)\\y"	"-- abc-"	"abc"	"abc"
+select * from test_regex('\y(\w+)\y', '-- abc-', 'LP');
+          test_regex           
+-------------------------------
+ {1,REG_UNONPOSIX,REG_ULOCALE}
+ {abc,abc}
+(2 rows)
+
+-- expectMatch	21.32 -		a((b|c)d+)+	abacdbd	acdbd	bd	b
+select * from test_regex('a((b|c)d+)+', 'abacdbd', '-');
+  test_regex  
+--------------
+ {2}
+ {acdbd,bd,b}
+(2 rows)
+
+-- expectMatch	21.33 N		(.*).*		abc	abc	abc
+select * from test_regex('(.*).*', 'abc', 'N');
+     test_regex      
+---------------------
+ {1,REG_UEMPTYMATCH}
+ {abc,abc}
+(2 rows)
+
+-- expectMatch	21.34 N		(a*)*		bc	""	""
+select * from test_regex('(a*)*', 'bc', 'N');
+     test_regex      
+---------------------
+ {1,REG_UEMPTYMATCH}
+ {"",""}
+(2 rows)
+
+-- expectMatch	21.35 M		{ TO (([a-z0-9._]+|"([^"]+|"")+")+)}	{asd TO foo}	{ TO foo} foo o {}
+select * from test_regex(' TO (([a-z0-9._]+|"([^"]+|"")+")+)', 'asd TO foo', 'M');
+       test_regex       
+------------------------
+ {3,REG_UUNPORT}
+ {" TO foo",foo,o,NULL}
+(2 rows)
+
+-- doing 22 "multicharacter collating elements"
+-- # again ugh
+-- MCCEs are not implemented in Postgres, so we skip all these tests
+-- expectMatch	22.1  &+L	{a[c]e}		ace	ace
+-- select * from test_regex('a[c]e', 'ace', '+L');
+-- select * from test_regex('a[c]e', 'ace', '+Lb');
+-- expectNomatch	22.2  &+IL	{a[c]h}		ach
+-- select * from test_regex('a[c]h', 'ach', '+IL');
+-- select * from test_regex('a[c]h', 'ach', '+ILb');
+-- expectMatch	22.3  &+L	{a[[.ch.]]}	ach	ach
+-- select * from test_regex('a[[.ch.]]', 'ach', '+L');
+-- select * from test_regex('a[[.ch.]]', 'ach', '+Lb');
+-- expectNomatch	22.4  &+L	{a[[.ch.]]}	ace
+-- select * from test_regex('a[[.ch.]]', 'ace', '+L');
+-- select * from test_regex('a[[.ch.]]', 'ace', '+Lb');
+-- expectMatch	22.5  &+L	{a[c[.ch.]]}	ac	ac
+-- select * from test_regex('a[c[.ch.]]', 'ac', '+L');
+-- select * from test_regex('a[c[.ch.]]', 'ac', '+Lb');
+-- expectMatch	22.6  &+L	{a[c[.ch.]]}	ace	ac
+-- select * from test_regex('a[c[.ch.]]', 'ace', '+L');
+-- select * from test_regex('a[c[.ch.]]', 'ace', '+Lb');
+-- expectMatch	22.7  &+L	{a[c[.ch.]]}	ache	ach
+-- select * from test_regex('a[c[.ch.]]', 'ache', '+L');
+-- select * from test_regex('a[c[.ch.]]', 'ache', '+Lb');
+-- expectNomatch	22.8  &+L	{a[^c]e}	ace
+-- select * from test_regex('a[^c]e', 'ace', '+L');
+-- select * from test_regex('a[^c]e', 'ace', '+Lb');
+-- expectMatch	22.9  &+L	{a[^c]e}	abe	abe
+-- select * from test_regex('a[^c]e', 'abe', '+L');
+-- select * from test_regex('a[^c]e', 'abe', '+Lb');
+-- expectMatch	22.10 &+L	{a[^c]e}	ache	ache
+-- select * from test_regex('a[^c]e', 'ache', '+L');
+-- select * from test_regex('a[^c]e', 'ache', '+Lb');
+-- expectNomatch	22.11 &+L	{a[^[.ch.]]}	ach
+-- select * from test_regex('a[^[.ch.]]', 'ach', '+L');
+-- select * from test_regex('a[^[.ch.]]', 'ach', '+Lb');
+-- expectMatch	22.12 &+L	{a[^[.ch.]]}	ace	ac
+-- select * from test_regex('a[^[.ch.]]', 'ace', '+L');
+-- select * from test_regex('a[^[.ch.]]', 'ace', '+Lb');
+-- expectMatch	22.13 &+L	{a[^[.ch.]]}	ac	ac
+-- select * from test_regex('a[^[.ch.]]', 'ac', '+L');
+-- select * from test_regex('a[^[.ch.]]', 'ac', '+Lb');
+-- expectMatch	22.14 &+L	{a[^[.ch.]]}	abe	ab
+-- select * from test_regex('a[^[.ch.]]', 'abe', '+L');
+-- select * from test_regex('a[^[.ch.]]', 'abe', '+Lb');
+-- expectNomatch	22.15 &+L	{a[^c[.ch.]]}	ach
+-- select * from test_regex('a[^c[.ch.]]', 'ach', '+L');
+-- select * from test_regex('a[^c[.ch.]]', 'ach', '+Lb');
+-- expectNomatch	22.16 &+L	{a[^c[.ch.]]}	ace
+-- select * from test_regex('a[^c[.ch.]]', 'ace', '+L');
+-- select * from test_regex('a[^c[.ch.]]', 'ace', '+Lb');
+-- expectNomatch	22.17 &+L	{a[^c[.ch.]]}	ac
+-- select * from test_regex('a[^c[.ch.]]', 'ac', '+L');
+-- select * from test_regex('a[^c[.ch.]]', 'ac', '+Lb');
+-- expectMatch	22.18 &+L	{a[^c[.ch.]]}	abe	ab
+-- select * from test_regex('a[^c[.ch.]]', 'abe', '+L');
+-- select * from test_regex('a[^c[.ch.]]', 'abe', '+Lb');
+-- expectMatch	22.19 &+L	{a[^b]}		ac	ac
+-- select * from test_regex('a[^b]', 'ac', '+L');
+-- select * from test_regex('a[^b]', 'ac', '+Lb');
+-- expectMatch	22.20 &+L	{a[^b]}		ace	ac
+-- select * from test_regex('a[^b]', 'ace', '+L');
+-- select * from test_regex('a[^b]', 'ace', '+Lb');
+-- expectMatch	22.21 &+L	{a[^b]}		ach	ach
+-- select * from test_regex('a[^b]', 'ach', '+L');
+-- select * from test_regex('a[^b]', 'ach', '+Lb');
+-- expectNomatch	22.22 &+L	{a[^b]}		abe
+-- select * from test_regex('a[^b]', 'abe', '+L');
+-- select * from test_regex('a[^b]', 'abe', '+Lb');
+-- doing 23 "lookahead constraints"
+-- expectMatch	23.1 HP		a(?=b)b*	ab	ab
+select * from test_regex('a(?=b)b*', 'ab', 'HP');
+            test_regex             
+-----------------------------------
+ {0,REG_ULOOKAROUND,REG_UNONPOSIX}
+ {ab}
+(2 rows)
+
+-- expectNomatch	23.2 HP		a(?=b)b*	a
+select * from test_regex('a(?=b)b*', 'a', 'HP');
+            test_regex             
+-----------------------------------
+ {0,REG_ULOOKAROUND,REG_UNONPOSIX}
+(1 row)
+
+-- expectMatch	23.3 HP		a(?=b)b*(?=c)c*	abc	abc
+select * from test_regex('a(?=b)b*(?=c)c*', 'abc', 'HP');
+            test_regex             
+-----------------------------------
+ {0,REG_ULOOKAROUND,REG_UNONPOSIX}
+ {abc}
+(2 rows)
+
+-- expectNomatch	23.4 HP		a(?=b)b*(?=c)c*	ab
+select * from test_regex('a(?=b)b*(?=c)c*', 'ab', 'HP');
+            test_regex             
+-----------------------------------
+ {0,REG_ULOOKAROUND,REG_UNONPOSIX}
+(1 row)
+
+-- expectNomatch	23.5 HP		a(?!b)b*	ab
+select * from test_regex('a(?!b)b*', 'ab', 'HP');
+            test_regex             
+-----------------------------------
+ {0,REG_ULOOKAROUND,REG_UNONPOSIX}
+(1 row)
+
+-- expectMatch	23.6 HP		a(?!b)b*	a	a
+select * from test_regex('a(?!b)b*', 'a', 'HP');
+            test_regex             
+-----------------------------------
+ {0,REG_ULOOKAROUND,REG_UNONPOSIX}
+ {a}
+(2 rows)
+
+-- expectMatch	23.7 HP		(?=b)b		b	b
+select * from test_regex('(?=b)b', 'b', 'HP');
+            test_regex             
+-----------------------------------
+ {0,REG_ULOOKAROUND,REG_UNONPOSIX}
+ {b}
+(2 rows)
+
+-- expectNomatch	23.8 HP		(?=b)b		a
+select * from test_regex('(?=b)b', 'a', 'HP');
+            test_regex             
+-----------------------------------
+ {0,REG_ULOOKAROUND,REG_UNONPOSIX}
+(1 row)
+
+-- Postgres addition: lookbehind constraints
+-- expectMatch	23.11 HPN		(?<=a)b*	ab	b
+select * from test_regex('(?<=a)b*', 'ab', 'HPN');
+                    test_regex                     
+---------------------------------------------------
+ {0,REG_ULOOKAROUND,REG_UNONPOSIX,REG_UEMPTYMATCH}
+ {b}
+(2 rows)
+
+-- expectNomatch	23.12 HPN		(?<=a)b*	b
+select * from test_regex('(?<=a)b*', 'b', 'HPN');
+                    test_regex                     
+---------------------------------------------------
+ {0,REG_ULOOKAROUND,REG_UNONPOSIX,REG_UEMPTYMATCH}
+(1 row)
+
+-- expectMatch	23.13 HP		(?<=a)b*(?<=b)c*	abc	bc
+select * from test_regex('(?<=a)b*(?<=b)c*', 'abc', 'HP');
+            test_regex             
+-----------------------------------
+ {0,REG_ULOOKAROUND,REG_UNONPOSIX}
+ {bc}
+(2 rows)
+
+-- expectNomatch	23.14 HP		(?<=a)b*(?<=b)c*	ac
+select * from test_regex('(?<=a)b*(?<=b)c*', 'ac', 'HP');
+            test_regex             
+-----------------------------------
+ {0,REG_ULOOKAROUND,REG_UNONPOSIX}
+(1 row)
+
+-- expectNomatch	23.15 IHP		a(?<!a)b*	ab
+select * from test_regex('a(?<!a)b*', 'ab', 'IHP');
+                    test_regex                     
+---------------------------------------------------
+ {0,REG_ULOOKAROUND,REG_UNONPOSIX,REG_UIMPOSSIBLE}
+(1 row)
+
+-- expectMatch	23.16 HP		a(?<!b)b*	a	a
+select * from test_regex('a(?<!b)b*', 'a', 'HP');
+            test_regex             
+-----------------------------------
+ {0,REG_ULOOKAROUND,REG_UNONPOSIX}
+ {a}
+(2 rows)
+
+-- expectMatch	23.17 HP		(?<=b)b		bb	b
+select * from test_regex('(?<=b)b', 'bb', 'HP');
+            test_regex             
+-----------------------------------
+ {0,REG_ULOOKAROUND,REG_UNONPOSIX}
+ {b}
+(2 rows)
+
+-- expectNomatch	23.18 HP		(?<=b)b		b
+select * from test_regex('(?<=b)b', 'b', 'HP');
+            test_regex             
+-----------------------------------
+ {0,REG_ULOOKAROUND,REG_UNONPOSIX}
+(1 row)
+
+-- doing 24 "non-greedy quantifiers"
+-- expectMatch	24.1  PT	ab+?		abb	ab
+select * from test_regex('ab+?', 'abb', 'PT');
+           test_regex            
+---------------------------------
+ {0,REG_UNONPOSIX,REG_USHORTEST}
+ {ab}
+(2 rows)
+
+-- expectMatch	24.2  PT	ab+?c		abbc	abbc
+select * from test_regex('ab+?c', 'abbc', 'PT');
+           test_regex            
+---------------------------------
+ {0,REG_UNONPOSIX,REG_USHORTEST}
+ {abbc}
+(2 rows)
+
+-- expectMatch	24.3  PT	ab*?		abb	a
+select * from test_regex('ab*?', 'abb', 'PT');
+           test_regex            
+---------------------------------
+ {0,REG_UNONPOSIX,REG_USHORTEST}
+ {a}
+(2 rows)
+
+-- expectMatch	24.4  PT	ab*?c		abbc	abbc
+select * from test_regex('ab*?c', 'abbc', 'PT');
+           test_regex            
+---------------------------------
+ {0,REG_UNONPOSIX,REG_USHORTEST}
+ {abbc}
+(2 rows)
+
+-- expectMatch	24.5  PT	ab??		ab	a
+select * from test_regex('ab??', 'ab', 'PT');
+           test_regex            
+---------------------------------
+ {0,REG_UNONPOSIX,REG_USHORTEST}
+ {a}
+(2 rows)
+
+-- expectMatch	24.6  PT	ab??c		abc	abc
+select * from test_regex('ab??c', 'abc', 'PT');
+           test_regex            
+---------------------------------
+ {0,REG_UNONPOSIX,REG_USHORTEST}
+ {abc}
+(2 rows)
+
+-- expectMatch	24.7  PQT	"ab{2,4}?"	abbbb	abb
+select * from test_regex('ab{2,4}?', 'abbbb', 'PQT');
+                 test_regex                  
+---------------------------------------------
+ {0,REG_UBOUNDS,REG_UNONPOSIX,REG_USHORTEST}
+ {abb}
+(2 rows)
+
+-- expectMatch	24.8  PQT	"ab{2,4}?c"	abbbbc	abbbbc
+select * from test_regex('ab{2,4}?c', 'abbbbc', 'PQT');
+                 test_regex                  
+---------------------------------------------
+ {0,REG_UBOUNDS,REG_UNONPOSIX,REG_USHORTEST}
+ {abbbbc}
+(2 rows)
+
+-- expectMatch	24.9  -		3z*		123zzzz456	3zzzz
+select * from test_regex('3z*', '123zzzz456', '-');
+ test_regex 
+------------
+ {0}
+ {3zzzz}
+(2 rows)
+
+-- expectMatch	24.10 PT	3z*?		123zzzz456	3
+select * from test_regex('3z*?', '123zzzz456', 'PT');
+           test_regex            
+---------------------------------
+ {0,REG_UNONPOSIX,REG_USHORTEST}
+ {3}
+(2 rows)
+
+-- expectMatch	24.11 -		z*4		123zzzz456	zzzz4
+select * from test_regex('z*4', '123zzzz456', '-');
+ test_regex 
+------------
+ {0}
+ {zzzz4}
+(2 rows)
+
+-- expectMatch	24.12 PT	z*?4		123zzzz456	zzzz4
+select * from test_regex('z*?4', '123zzzz456', 'PT');
+           test_regex            
+---------------------------------
+ {0,REG_UNONPOSIX,REG_USHORTEST}
+ {zzzz4}
+(2 rows)
+
+-- expectMatch	24.13 PT	{^([^/]+?)(?:/([^/]+?))(?:/([^/]+?))?$}	{foo/bar/baz}	{foo/bar/baz} {foo} {bar} {baz}
+select * from test_regex('^([^/]+?)(?:/([^/]+?))(?:/([^/]+?))?$', 'foo/bar/baz', 'PT');
+           test_regex            
+---------------------------------
+ {3,REG_UNONPOSIX,REG_USHORTEST}
+ {foo/bar/baz,foo,bar,baz}
+(2 rows)
+
+-- doing 25 "mixed quantifiers"
+-- # this is very incomplete as yet
+-- # should include |
+-- expectMatch	25.1 PNT	{^(.*?)(a*)$}	"xyza"	xyza	xyz	a
+select * from test_regex('^(.*?)(a*)$', 'xyza', 'PNT');
+                   test_regex                    
+-------------------------------------------------
+ {2,REG_UNONPOSIX,REG_UEMPTYMATCH,REG_USHORTEST}
+ {xyza,xyz,a}
+(2 rows)
+
+-- expectMatch	25.2 PNT	{^(.*?)(a*)$}	"xyzaa"	xyzaa	xyz	aa
+select * from test_regex('^(.*?)(a*)$', 'xyzaa', 'PNT');
+                   test_regex                    
+-------------------------------------------------
+ {2,REG_UNONPOSIX,REG_UEMPTYMATCH,REG_USHORTEST}
+ {xyzaa,xyz,aa}
+(2 rows)
+
+-- expectMatch	25.3 PNT	{^(.*?)(a*)$}	"xyz"	xyz	xyz	""
+select * from test_regex('^(.*?)(a*)$', 'xyz', 'PNT');
+                   test_regex                    
+-------------------------------------------------
+ {2,REG_UNONPOSIX,REG_UEMPTYMATCH,REG_USHORTEST}
+ {xyz,xyz,""}
+(2 rows)
+
+-- doing 26 "tricky cases"
+-- # attempts to trick the matcher into accepting a short match
+-- expectMatch	26.1 -		(week|wee)(night|knights) \
+-- 	"weeknights" weeknights wee knights
+select * from test_regex('(week|wee)(night|knights)', 'weeknights', '-');
+        test_regex        
+--------------------------
+ {2}
+ {weeknights,wee,knights}
+(2 rows)
+
+-- expectMatch	26.2 RP		{a(bc*).*\1}	abccbccb abccbccb	b
+select * from test_regex('a(bc*).*\1', 'abccbccb', 'RP');
+           test_regex           
+--------------------------------
+ {1,REG_UBACKREF,REG_UNONPOSIX}
+ {abccbccb,b}
+(2 rows)
+
+-- expectMatch	26.3 -		{a(b.[bc]*)+}	abcbd	abcbd	bd
+select * from test_regex('a(b.[bc]*)+', 'abcbd', '-');
+ test_regex 
+------------
+ {1}
+ {abcbd,bd}
+(2 rows)
+
+-- doing 27 "implementation misc."
+-- # duplicate arcs are suppressed
+-- expectMatch	27.1 P		a(?:b|b)c	abc	abc
+select * from test_regex('a(?:b|b)c', 'abc', 'P');
+    test_regex     
+-------------------
+ {0,REG_UNONPOSIX}
+ {abc}
+(2 rows)
+
+-- # make color/subcolor relationship go back and forth
+-- expectMatch	27.2 &		{[ab][ab][ab]}	aba	aba
+select * from test_regex('[ab][ab][ab]', 'aba', '');
+ test_regex 
+------------
+ {0}
+ {aba}
+(2 rows)
+
+select * from test_regex('[ab][ab][ab]', 'aba', 'b');
+ test_regex 
+------------
+ {0}
+ {aba}
+(2 rows)
+
+-- expectMatch	27.3 &		{[ab][ab][ab][ab][ab][ab][ab]} \
+-- 	"abababa" abababa
+select * from test_regex('[ab][ab][ab][ab][ab][ab][ab]', 'abababa', '');
+ test_regex 
+------------
+ {0}
+ {abababa}
+(2 rows)
+
+select * from test_regex('[ab][ab][ab][ab][ab][ab][ab]', 'abababa', 'b');
+ test_regex 
+------------
+ {0}
+ {abababa}
+(2 rows)
+
+-- doing 28 "boundary busters etc."
+-- # color-descriptor allocation changes at 10
+-- expectMatch	28.1 &		abcdefghijkl	"abcdefghijkl"	abcdefghijkl
+select * from test_regex('abcdefghijkl', 'abcdefghijkl', '');
+   test_regex   
+----------------
+ {0}
+ {abcdefghijkl}
+(2 rows)
+
+select * from test_regex('abcdefghijkl', 'abcdefghijkl', 'b');
+   test_regex   
+----------------
+ {0}
+ {abcdefghijkl}
+(2 rows)
+
+-- # so does arc allocation
+-- expectMatch	28.2 P		a(?:b|c|d|e|f|g|h|i|j|k|l|m)n	"agn"	agn
+select * from test_regex('a(?:b|c|d|e|f|g|h|i|j|k|l|m)n', 'agn', 'P');
+    test_regex     
+-------------------
+ {0,REG_UNONPOSIX}
+ {agn}
+(2 rows)
+
+-- # subexpression tracking also at 10
+-- expectMatch	28.3 -		a(((((((((((((b)))))))))))))c \
+-- 	"abc" abc b b b b b b b b b b b b b
+select * from test_regex('a(((((((((((((b)))))))))))))c', 'abc', '-');
+           test_regex            
+---------------------------------
+ {13}
+ {abc,b,b,b,b,b,b,b,b,b,b,b,b,b}
+(2 rows)
+
+-- # state-set handling changes slightly at unsigned size (might be 64...)
+-- # (also stresses arc allocation)
+-- expectMatch	28.4  Q		"ab{1,100}c"	abbc	abbc
+select * from test_regex('ab{1,100}c', 'abbc', 'Q');
+   test_regex    
+-----------------
+ {0,REG_UBOUNDS}
+ {abbc}
+(2 rows)
+
+-- expectMatch	28.5  Q		"ab{1,100}c" \
+-- 	"abbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbc" \
+-- 	abbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbc
+select * from test_regex('ab{1,100}c', 'abbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbc', 'Q');
+              test_regex               
+---------------------------------------
+ {0,REG_UBOUNDS}
+ {abbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbc}
+(2 rows)
+
+-- expectMatch	28.6  Q		"ab{1,100}c" \
+-- 	"abbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbc"\
+-- 	abbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbc
+select * from test_regex('ab{1,100}c', 'abbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbc', 'Q');
+                               test_regex                               
+------------------------------------------------------------------------
+ {0,REG_UBOUNDS}
+ {abbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbc}
+(2 rows)
+
+-- # force small cache and bust it, several ways
+-- expectMatch	28.7  LP	{\w+abcdefgh}	xyzabcdefgh	xyzabcdefgh
+select * from test_regex('\w+abcdefgh', 'xyzabcdefgh', 'LP');
+          test_regex           
+-------------------------------
+ {0,REG_UNONPOSIX,REG_ULOCALE}
+ {xyzabcdefgh}
+(2 rows)
+
+-- expectMatch	28.8  %LP	{\w+abcdefgh}	xyzabcdefgh	xyzabcdefgh
+select * from test_regex('\w+abcdefgh', 'xyzabcdefgh', '%LP');
+          test_regex           
+-------------------------------
+ {0,REG_UNONPOSIX,REG_ULOCALE}
+ {xyzabcdefgh}
+(2 rows)
+
+-- expectMatch	28.9  %LP	{\w+abcdefghijklmnopqrst} \
+-- 	"xyzabcdefghijklmnopqrst" xyzabcdefghijklmnopqrst
+select * from test_regex('\w+abcdefghijklmnopqrst', 'xyzabcdefghijklmnopqrst', '%LP');
+          test_regex           
+-------------------------------
+ {0,REG_UNONPOSIX,REG_ULOCALE}
+ {xyzabcdefghijklmnopqrst}
+(2 rows)
+
+-- expectIndices	28.10 %LP	{\w+(abcdefgh)?} xyz	{0 2}	{-1 -1}
+select * from test_regex('\w+(abcdefgh)?', 'xyz', '0%LP');
+          test_regex           
+-------------------------------
+ {1,REG_UNONPOSIX,REG_ULOCALE}
+ {"0 2","-1 -1"}
+(2 rows)
+
+-- expectIndices	28.11 %LP	{\w+(abcdefgh)?} xyzabcdefg	{0 9}	{-1 -1}
+select * from test_regex('\w+(abcdefgh)?', 'xyzabcdefg', '0%LP');
+          test_regex           
+-------------------------------
+ {1,REG_UNONPOSIX,REG_ULOCALE}
+ {"0 9","-1 -1"}
+(2 rows)
+
+-- expectIndices	28.12 %LP	{\w+(abcdefghijklmnopqrst)?} \
+-- 	"xyzabcdefghijklmnopqrs" {0 21} {-1 -1}
+select * from test_regex('\w+(abcdefghijklmnopqrst)?', 'xyzabcdefghijklmnopqrs', '0%LP');
+          test_regex           
+-------------------------------
+ {1,REG_UNONPOSIX,REG_ULOCALE}
+ {"0 21","-1 -1"}
+(2 rows)
+
+-- doing 29 "incomplete matches"
+-- expectPartial		29.1  t		def	abc	{3 2}	""
+select * from test_regex('def', 'abc', '0!t');
+  test_regex   
+---------------
+ {0}
+ {"3 2","3 2"}
+(2 rows)
+
+-- expectPartial		29.2  t		bcd	abc	{1 2}	""
+select * from test_regex('bcd', 'abc', '0!t');
+  test_regex   
+---------------
+ {0}
+ {"1 2","1 2"}
+(2 rows)
+
+-- expectPartial		29.3  t		abc	abab	{0 3}	""
+select * from test_regex('abc', 'abab', '0!t');
+  test_regex   
+---------------
+ {0}
+ {"0 3","0 3"}
+(2 rows)
+
+-- expectPartial		29.4  t		abc	abdab	{3 4}	""
+select * from test_regex('abc', 'abdab', '0!t');
+  test_regex   
+---------------
+ {0}
+ {"3 4","3 4"}
+(2 rows)
+
+-- expectIndices		29.5  t		abc	abc	{0 2}	{0 2}
+select * from test_regex('abc', 'abc', '0t');
+  test_regex   
+---------------
+ {0}
+ {"0 2","0 2"}
+(2 rows)
+
+-- expectIndices		29.6  t		abc	xyabc	{2 4}	{2 4}
+select * from test_regex('abc', 'xyabc', '0t');
+  test_regex   
+---------------
+ {0}
+ {"2 4","2 4"}
+(2 rows)
+
+-- expectPartial		29.7  t		abc+	xyab	{2 3}	""
+select * from test_regex('abc+', 'xyab', '0!t');
+  test_regex   
+---------------
+ {0}
+ {"2 3","2 3"}
+(2 rows)
+
+-- expectIndices		29.8  t		abc+	xyabc	{2 4}	{2 4}
+select * from test_regex('abc+', 'xyabc', '0t');
+  test_regex   
+---------------
+ {0}
+ {"2 4","2 4"}
+(2 rows)
+
+-- knownBug expectIndices	29.9  t		abc+	xyabcd	{2 4}	{6 5}
+select * from test_regex('abc+', 'xyabcd', '0t');
+  test_regex   
+---------------
+ {0}
+ {"2 4","2 5"}
+(2 rows)
+
+-- expectIndices		29.10 t		abc+	xyabcdd	{2 4}	{7 6}
+select * from test_regex('abc+', 'xyabcdd', '0t');
+  test_regex   
+---------------
+ {0}
+ {"2 4","7 6"}
+(2 rows)
+
+-- expectPartial		29.11 tPT	abc+?	xyab	{2 3}	""
+select * from test_regex('abc+?', 'xyab', '0!tPT');
+           test_regex            
+---------------------------------
+ {0,REG_UNONPOSIX,REG_USHORTEST}
+ {"2 3","2 3"}
+(2 rows)
+
+-- # the retain numbers in these two may look wrong, but they aren't
+-- expectIndices		29.12 tPT	abc+?	xyabc	{2 4}	{5 4}
+select * from test_regex('abc+?', 'xyabc', '0tPT');
+           test_regex            
+---------------------------------
+ {0,REG_UNONPOSIX,REG_USHORTEST}
+ {"2 4","5 4"}
+(2 rows)
+
+-- expectIndices		29.13 tPT	abc+?	xyabcc	{2 4}	{6 5}
+select * from test_regex('abc+?', 'xyabcc', '0tPT');
+           test_regex            
+---------------------------------
+ {0,REG_UNONPOSIX,REG_USHORTEST}
+ {"2 4","6 5"}
+(2 rows)
+
+-- expectIndices		29.14 tPT	abc+?	xyabcd	{2 4}	{6 5}
+select * from test_regex('abc+?', 'xyabcd', '0tPT');
+           test_regex            
+---------------------------------
+ {0,REG_UNONPOSIX,REG_USHORTEST}
+ {"2 4","6 5"}
+(2 rows)
+
+-- expectIndices		29.15 tPT	abc+?	xyabcdd	{2 4}	{7 6}
+select * from test_regex('abc+?', 'xyabcdd', '0tPT');
+           test_regex            
+---------------------------------
+ {0,REG_UNONPOSIX,REG_USHORTEST}
+ {"2 4","7 6"}
+(2 rows)
+
+-- expectIndices		29.16 t		abcd|bc	xyabc	{3 4}	{2 4}
+select * from test_regex('abcd|bc', 'xyabc', '0t');
+  test_regex   
+---------------
+ {0}
+ {"3 4","2 4"}
+(2 rows)
+
+-- expectPartial		29.17 tn	.*k	"xx\nyyy"	{3 5}	""
+select * from test_regex('.*k', E'xx\nyyy', '0!tn');
+  test_regex   
+---------------
+ {0}
+ {"3 5","3 5"}
+(2 rows)
+
+-- doing 30 "misc. oddities and old bugs"
+-- expectError	30.1 &		***	BADRPT
+select * from test_regex('***', '', '');
+ERROR:  invalid regular expression: quantifier operand invalid
+select * from test_regex('***', '', 'b');
+ERROR:  invalid regular expression: quantifier operand invalid
+-- expectMatch	30.2 N		a?b*	abb	abb
+select * from test_regex('a?b*', 'abb', 'N');
+     test_regex      
+---------------------
+ {0,REG_UEMPTYMATCH}
+ {abb}
+(2 rows)
+
+-- expectMatch	30.3 N		a?b*	bb	bb
+select * from test_regex('a?b*', 'bb', 'N');
+     test_regex      
+---------------------
+ {0,REG_UEMPTYMATCH}
+ {bb}
+(2 rows)
+
+-- expectMatch	30.4 &		a*b	aab	aab
+select * from test_regex('a*b', 'aab', '');
+ test_regex 
+------------
+ {0}
+ {aab}
+(2 rows)
+
+select * from test_regex('a*b', 'aab', 'b');
+ test_regex 
+------------
+ {0}
+ {aab}
+(2 rows)
+
+-- expectMatch	30.5 &		^a*b	aaaab	aaaab
+select * from test_regex('^a*b', 'aaaab', '');
+ test_regex 
+------------
+ {0}
+ {aaaab}
+(2 rows)
+
+select * from test_regex('^a*b', 'aaaab', 'b');
+ test_regex 
+------------
+ {0}
+ {aaaab}
+(2 rows)
+
+-- expectMatch	30.6 &M		{[0-6][1-2][0-3][0-6][1-6][0-6]} \
+-- 	"010010" 010010
+select * from test_regex('[0-6][1-2][0-3][0-6][1-6][0-6]', '010010', 'M');
+   test_regex    
+-----------------
+ {0,REG_UUNPORT}
+ {010010}
+(2 rows)
+
+select * from test_regex('[0-6][1-2][0-3][0-6][1-6][0-6]', '010010', 'Mb');
+   test_regex    
+-----------------
+ {0,REG_UUNPORT}
+ {010010}
+(2 rows)
+
+-- # temporary REG_BOSONLY kludge
+-- expectMatch	30.7 s		abc	abcd	abc
+select * from test_regex('abc', 'abcd', 's');
+ test_regex 
+------------
+ {0}
+ {abc}
+(2 rows)
+
+-- expectNomatch	30.8 s		abc	xabcd
+select * from test_regex('abc', 'xabcd', 's');
+ test_regex 
+------------
+ {0}
+(1 row)
+
+-- # back to normal stuff
+-- expectMatch	30.9 HLP	{(?n)^(?![t#])\S+} \
+-- 	"tk\n\n#\n#\nit0"	it0
+select * from test_regex('(?n)^(?![t#])\S+', E'tk\n\n#\n#\nit0', 'HLP');
+                  test_regex                   
+-----------------------------------------------
+ {0,REG_ULOOKAROUND,REG_UNONPOSIX,REG_ULOCALE}
+ {it0}
+(2 rows)
+
+-- # Now for tests *not* written by Henry Spencer
+-- # Tests resulting from bugs reported by users
+-- test reg-31.1 {[[:xdigit:]] behaves correctly when followed by [[:space:]]} {
+--     set str {2:::DebugWin32}
+--     set re {([[:xdigit:]])([[:space:]]*)}
+--     list [regexp $re $str match xdigit spaces] $match $xdigit $spaces
+--     # Code used to produce {1 2:::DebugWin32 2 :::DebugWin32} !!!
+-- } {1 2 2 {}}
+select * from test_regex('([[:xdigit:]])([[:space:]]*)', '2:::DebugWin32', 'L');
+   test_regex    
+-----------------
+ {2,REG_ULOCALE}
+ {2,2,""}
+(2 rows)
+
+-- test reg-32.1 {canmatch functionality -- at end} testregexp {
+--     set pat {blah}
+--     set line "asd asd"
+--     # can match at the final d, if '%' follows
+--     set res [testregexp -xflags -- c $pat $line resvar]
+--     lappend res $resvar
+-- } {0 7}
+select * from test_regex('blah', 'asd asd', 'c');
+  test_regex   
+---------------
+ {0}
+ {"7 6","7 6"}
+(2 rows)
+
+-- test reg-32.2 {canmatch functionality -- at end} testregexp {
+--     set pat {s%$}
+--     set line "asd asd"
+--     # can only match after the end of the string
+--     set res [testregexp -xflags -- c $pat $line resvar]
+--     lappend res $resvar
+-- } {0 7}
+select * from test_regex('s%$', 'asd asd', 'c');
+  test_regex   
+---------------
+ {0}
+ {"7 6","7 6"}
+(2 rows)
+
+-- test reg-32.3 {canmatch functionality -- not last char} testregexp {
+--     set pat {[^d]%$}
+--     set line "asd asd"
+--     # can only match after the end of the string
+--     set res [testregexp -xflags -- c $pat $line resvar]
+--     lappend res $resvar
+-- } {0 7}
+select * from test_regex('[^d]%$', 'asd asd', 'c');
+  test_regex   
+---------------
+ {0}
+ {"7 6","7 6"}
+(2 rows)
+
+-- test reg-32.3.1 {canmatch functionality -- no match} testregexp {
+--     set pat {\Zx}
+--     set line "asd asd"
+--     # can match the last char, if followed by x
+--     set res [testregexp -xflags -- c $pat $line resvar]
+--     lappend res $resvar
+-- } {0 -1}
+select * from test_regex('\Zx', 'asd asd', 'cIP');
+            test_regex             
+-----------------------------------
+ {0,REG_UNONPOSIX,REG_UIMPOSSIBLE}
+ {"-1 -1","-1 -1"}
+(2 rows)
+
+-- test reg-32.4 {canmatch functionality -- last char} {knownBug testregexp} {
+--     set pat {.x}
+--     set line "asd asd"
+--     # can match the last char, if followed by x
+--     set res [testregexp -xflags -- c $pat $line resvar]
+--     lappend res $resvar
+-- } {0 6}
+select * from test_regex('.x', 'asd asd', 'c');
+  test_regex   
+---------------
+ {0}
+ {"0 6","0 6"}
+(2 rows)
+
+-- test reg-32.4.1 {canmatch functionality -- last char} {knownBug testregexp} {
+--     set pat {.x$}
+--     set line "asd asd"
+--     # can match the last char, if followed by x
+--     set res [testregexp -xflags -- c $pat $line resvar]
+--     lappend res $resvar
+-- } {0 6}
+select * from test_regex('.x$', 'asd asd', 'c');
+  test_regex   
+---------------
+ {0}
+ {"0 6","0 6"}
+(2 rows)
+
+-- test reg-32.5 {canmatch functionality -- last char} {knownBug testregexp} {
+--     set pat {.[^d]x$}
+--     set line "asd asd"
+--     # can match the last char, if followed by not-d and x.
+--     set res [testregexp -xflags -- c $pat $line resvar]
+--     lappend res $resvar
+-- } {0 6}
+select * from test_regex('.[^d]x$', 'asd asd', 'c');
+  test_regex   
+---------------
+ {0}
+ {"0 6","0 6"}
+(2 rows)
+
+-- test reg-32.6 {canmatch functionality -- last char} {knownBug testregexp} {
+--     set pat {[^a]%[^\r\n]*$}
+--     set line "asd asd"
+--     # can match at the final d, if '%' follows
+--     set res [testregexp -xflags -- c $pat $line resvar]
+--     lappend res $resvar
+-- } {0 6}
+select * from test_regex('[^a]%[^\r\n]*$', 'asd asd', 'cEP');
+         test_regex         
+----------------------------
+ {0,REG_UBBS,REG_UNONPOSIX}
+ {"5 6","5 6"}
+(2 rows)
+
+-- test reg-32.7 {canmatch functionality -- last char} {knownBug testregexp} {
+--     set pat {[^a]%$}
+--     set line "asd asd"
+--     # can match at the final d, if '%' follows
+--     set res [testregexp -xflags -- c $pat $line resvar]
+--     lappend res $resvar
+-- } {0 6}
+select * from test_regex('[^a]%$', 'asd asd', 'c');
+  test_regex   
+---------------
+ {0}
+ {"5 6","5 6"}
+(2 rows)
+
+-- test reg-32.8 {canmatch functionality -- last char} {knownBug testregexp} {
+--     set pat {[^x]%$}
+--     set line "asd asd"
+--     # can match at the final d, if '%' follows
+--     set res [testregexp -xflags -- c $pat $line resvar]
+--     lappend res $resvar
+-- } {0 6}
+select * from test_regex('[^x]%$', 'asd asd', 'c');
+  test_regex   
+---------------
+ {0}
+ {"0 6","0 6"}
+(2 rows)
+
+-- test reg-32.9 {canmatch functionality -- more complex case} {knownBug testregexp} {
+--     set pat {((\B\B|\Bh+line)[ \t]*|[^\B]%[^\r\n]*)$}
+--     set line "asd asd"
+--     # can match at the final d, if '%' follows
+--     set res [testregexp -xflags -- c $pat $line resvar]
+--     lappend res $resvar
+-- } {0 6}
+select * from test_regex('((\B\B|\Bh+line)[ \t]*|[^\B]%[^\r\n]*)$', 'asd asd', 'cEP');
+          test_regex           
+-------------------------------
+ {2,REG_UBBS,REG_UNONPOSIX}
+ {"0 6","-1 -1","-1 -1","0 6"}
+(2 rows)
+
+-- # Tests reg-33.*: Checks for bug fixes
+-- test reg-33.1 {Bug 230589} {
+--     regexp {[ ]*(^|[^%])%V} "*%V2" m s
+-- } 1
+select * from test_regex('[ ]*(^|[^%])%V', '*%V2', '-');
+ test_regex 
+------------
+ {1}
+ {*%V,*}
+(2 rows)
+
+-- test reg-33.2 {Bug 504785} {
+--     regexp -inline {([^_.]*)([^.]*)\.(..)(.).*} bbcos_001_c01.q1la
+-- } {bbcos_001_c01.q1la bbcos _001_c01 q1 l}
+select * from test_regex('([^_.]*)([^.]*)\.(..)(.).*', 'bbcos_001_c01.q1la', '-');
+                test_regex                
+------------------------------------------
+ {4}
+ {bbcos_001_c01.q1la,bbcos,_001_c01,q1,l}
+(2 rows)
+
+-- test reg-33.3 {Bug 505048} {
+--     regexp {\A\s*[^<]*\s*<([^>]+)>} a<a>
+-- } 1
+select * from test_regex('\A\s*[^<]*\s*<([^>]+)>', 'a<a>', 'LP');
+          test_regex           
+-------------------------------
+ {1,REG_UNONPOSIX,REG_ULOCALE}
+ {a<a>,a}
+(2 rows)
+
+-- test reg-33.4 {Bug 505048} {
+--     regexp {\A\s*([^b]*)b} ab
+-- } 1
+select * from test_regex('\A\s*([^b]*)b', 'ab', 'LP');
+          test_regex           
+-------------------------------
+ {1,REG_UNONPOSIX,REG_ULOCALE}
+ {ab,a}
+(2 rows)
+
+-- test reg-33.5 {Bug 505048} {
+--     regexp {\A\s*[^b]*(b)} ab
+-- } 1
+select * from test_regex('\A\s*[^b]*(b)', 'ab', 'LP');
+          test_regex           
+-------------------------------
+ {1,REG_UNONPOSIX,REG_ULOCALE}
+ {ab,b}
+(2 rows)
+
+-- test reg-33.6 {Bug 505048} {
+--     regexp {\A(\s*)[^b]*(b)} ab
+-- } 1
+select * from test_regex('\A(\s*)[^b]*(b)', 'ab', 'LP');
+          test_regex           
+-------------------------------
+ {2,REG_UNONPOSIX,REG_ULOCALE}
+ {ab,"",b}
+(2 rows)
+
+-- test reg-33.7 {Bug 505048} {
+--     regexp {\A\s*[^b]*b} ab
+-- } 1
+select * from test_regex('\A\s*[^b]*b', 'ab', 'LP');
+          test_regex           
+-------------------------------
+ {0,REG_UNONPOSIX,REG_ULOCALE}
+ {ab}
+(2 rows)
+
+-- test reg-33.8 {Bug 505048} {
+--     regexp -inline {\A\s*[^b]*b} ab
+-- } ab
+select * from test_regex('\A\s*[^b]*b', 'ab', 'LP');
+          test_regex           
+-------------------------------
+ {0,REG_UNONPOSIX,REG_ULOCALE}
+ {ab}
+(2 rows)
+
+-- test reg-33.9 {Bug 505048} {
+--     regexp -indices -inline {\A\s*[^b]*b} ab
+-- } {{0 1}}
+select * from test_regex('\A\s*[^b]*b', 'ab', '0LP');
+          test_regex           
+-------------------------------
+ {0,REG_UNONPOSIX,REG_ULOCALE}
+ {"0 1"}
+(2 rows)
+
+-- test reg-33.10 {Bug 840258} -body {
+--     regsub {(^|\n)+\.*b} \n.b {} tmp
+-- } -cleanup {
+--     unset tmp
+-- } -result 1
+select * from test_regex('(^|\n)+\.*b', E'\n.b', 'P');
+    test_regex     
+-------------------
+ {1,REG_UNONPOSIX}
+ {"               +
+ .b","            +
+ "}
+(2 rows)
+
+-- test reg-33.11 {Bug 840258} -body {
+--     regsub {(^|[\n\r]+)\.*\?<.*?(\n|\r)+} \
+-- 	    "TQ\r\n.?<5000267>Test already stopped\r\n" {} tmp
+-- } -cleanup {
+--     unset tmp
+-- } -result 1
+select * from test_regex('(^|[\n\r]+)\.*\?<.*?(\n|\r)+', E'TQ\r\n.?<5000267>Test already stopped\r\n', 'EP');
+            test_regex             
+-----------------------------------
+ {2,REG_UBBS,REG_UNONPOSIX}
+ {"\r                             +
+ .?<5000267>Test already stopped\r+
+ ","\r                            +
+ ","                              +
+ "}
+(2 rows)
+
+-- test reg-33.12 {Bug 1810264 - bad read} {
+--     regexp {\3161573148} {\3161573148}
+-- } 0
+select * from test_regex('\3161573148', '\3161573148', 'MP');
+          test_regex           
+-------------------------------
+ {0,REG_UNONPOSIX,REG_UUNPORT}
+(1 row)
+
+-- test reg-33.13 {Bug 1810264 - infinite loop} {
+--     regexp {($|^)*} {x}
+-- } 1
+select * from test_regex('($|^)*', 'x', 'N');
+     test_regex      
+---------------------
+ {1,REG_UEMPTYMATCH}
+ {"",""}
+(2 rows)
+
+-- # Some environments have small default stack sizes. [Bug 1905562]
+-- test reg-33.14 {Bug 1810264 - super-expensive expression} nonPortable {
+--     regexp {(x{200}){200}$y} {x}
+-- } 0
+-- This might or might not work depending on platform, so skip it
+-- select * from test_regex('(x{200}){200}$y', 'x', 'IQ');
+-- test reg-33.15.1 {Bug 3603557 - an "in the wild" RE} {
+--     lindex [regexp -expanded -about {
+-- 	^TETRA_MODE_CMD				# Message Type
+-- 	([[:blank:]]+)				# Pad
+-- 	(ETS_1_1|ETS_1_2|ETS_2_2)		# SystemCode
+-- 	([[:blank:]]+)				# Pad
+-- 	(CONTINUOUS|CARRIER|MCCH|TRAFFIC)	# SharingMode
+-- 	([[:blank:]]+)				# Pad
+-- 	([[:digit:]]{1,2})			# ColourCode
+-- 	([[:blank:]]+)				# Pad
+-- 	(1|2|3|4|6|9|12|18)			# TSReservedFrames
+-- 	([[:blank:]]+)				# Pad
+-- 	(PASS|TRUE|FAIL|FALSE)			# UPlaneDTX
+-- 	([[:blank:]]+)				# Pad
+-- 	(PASS|TRUE|FAIL|FALSE)			# Frame18Extension
+-- 	([[:blank:]]+)				# Pad
+-- 	([[:digit:]]{1,4})			# MCC
+-- 	([[:blank:]]+)				# Pad
+-- 	([[:digit:]]{1,5})			# MNC
+-- 	([[:blank:]]+)				# Pad
+-- 	(BOTH|BCAST|ENQRY|NONE)			# NbrCellBcast
+-- 	([[:blank:]]+)				# Pad
+-- 	(UNKNOWN|LOW|MEDIUM|HIGH)		# CellServiceLevel
+-- 	([[:blank:]]+)				# Pad
+-- 	(PASS|TRUE|FAIL|FALSE)			# LateEntryInfo
+-- 	([[:blank:]]+)				# Pad
+-- 	(300|400)				# FrequencyBand
+-- 	([[:blank:]]+)				# Pad
+-- 	(NORMAL|REVERSE)			# ReverseOperation
+-- 	([[:blank:]]+)				# Pad
+-- 	(NONE|\+6\.25|\-6\.25|\+12\.5)		# Offset
+-- 	([[:blank:]]+)				# Pad
+-- 	(10)					# DuplexSpacing
+-- 	([[:blank:]]+)				# Pad
+-- 	([[:digit:]]{1,4})			# MainCarrierNr
+-- 	([[:blank:]]+)				# Pad
+-- 	(0|1|2|3)				# NrCSCCH
+-- 	([[:blank:]]+)				# Pad
+-- 	(15|20|25|30|35|40|45)			# MSTxPwrMax
+-- 	([[:blank:]]+)				# Pad
+-- 	(\-125|\-120|\-115|\-110|\-105|\-100|\-95|\-90|\-85|\-80|\-75|\-70|\-65|\-60|\-55|\-50)
+-- 						# RxLevAccessMin
+-- 	([[:blank:]]+)				# Pad
+-- 	(\-53|\-51|\-49|\-47|\-45|\-43|\-41|\-39|\-37|\-35|\-33|\-31|\-29|\-27|\-25|\-23)
+-- 						# AccessParameter
+-- 	([[:blank:]]+)				# Pad
+-- 	(DISABLE|[[:digit:]]{3,4})		# RadioDLTimeout
+-- 	([[:blank:]]+)				# Pad
+-- 	(\-[[:digit:]]{2,3})			# RSSIThreshold
+-- 	([[:blank:]]+)				# Pad
+-- 	([[:digit:]]{1,5})			# CCKIdSCKVerNr
+-- 	([[:blank:]]+)				# Pad
+-- 	([[:digit:]]{1,5})			# LocationArea
+-- 	([[:blank:]]+)				# Pad
+-- 	([(1|0)]{16})				# SubscriberClass
+-- 	([[:blank:]]+)				# Pad
+-- 	([(1|0)]{12})				# BSServiceDetails
+-- 	([[:blank:]]+)				# Pad
+-- 	(RANDOMIZE|IMMEDIATE|[[:digit:]]{1,2})	# IMM
+-- 	([[:blank:]]+)				# Pad
+-- 	([[:digit:]]{1,2})			# WT
+-- 	([[:blank:]]+)				# Pad
+-- 	([[:digit:]]{1,2})			# Nu
+-- 	([[:blank:]]+)				# Pad
+-- 	([0-1])					# FrameLngFctr
+-- 	([[:blank:]]+)				# Pad
+-- 	([[:digit:]]{1,2})			# TSPtr
+-- 	([[:blank:]]+)				# Pad
+-- 	([0-7])					# MinPriority
+-- 	([[:blank:]]+)				# Pad
+-- 	(PASS|TRUE|FAIL|FALSE)			# ExtdSrvcsEnabled
+-- 	([[:blank:]]+)				# Pad
+-- 	(.*)					# ConditionalFields
+--     }] 0
+-- } 68
+select * from test_regex($$
+	^TETRA_MODE_CMD				# Message Type
+	([[:blank:]]+)				# Pad
+	(ETS_1_1|ETS_1_2|ETS_2_2)		# SystemCode
+	([[:blank:]]+)				# Pad
+	(CONTINUOUS|CARRIER|MCCH|TRAFFIC)	# SharingMode
+	([[:blank:]]+)				# Pad
+	([[:digit:]]{1,2})			# ColourCode
+	([[:blank:]]+)				# Pad
+	(1|2|3|4|6|9|12|18)			# TSReservedFrames
+	([[:blank:]]+)				# Pad
+	(PASS|TRUE|FAIL|FALSE)			# UPlaneDTX
+	([[:blank:]]+)				# Pad
+	(PASS|TRUE|FAIL|FALSE)			# Frame18Extension
+	([[:blank:]]+)				# Pad
+	([[:digit:]]{1,4})			# MCC
+	([[:blank:]]+)				# Pad
+	([[:digit:]]{1,5})			# MNC
+	([[:blank:]]+)				# Pad
+	(BOTH|BCAST|ENQRY|NONE)			# NbrCellBcast
+	([[:blank:]]+)				# Pad
+	(UNKNOWN|LOW|MEDIUM|HIGH)		# CellServiceLevel
+	([[:blank:]]+)				# Pad
+	(PASS|TRUE|FAIL|FALSE)			# LateEntryInfo
+	([[:blank:]]+)				# Pad
+	(300|400)				# FrequencyBand
+	([[:blank:]]+)				# Pad
+	(NORMAL|REVERSE)			# ReverseOperation
+	([[:blank:]]+)				# Pad
+	(NONE|\+6\.25|\-6\.25|\+12\.5)		# Offset
+	([[:blank:]]+)				# Pad
+	(10)					# DuplexSpacing
+	([[:blank:]]+)				# Pad
+	([[:digit:]]{1,4})			# MainCarrierNr
+	([[:blank:]]+)				# Pad
+	(0|1|2|3)				# NrCSCCH
+	([[:blank:]]+)				# Pad
+	(15|20|25|30|35|40|45)			# MSTxPwrMax
+	([[:blank:]]+)				# Pad
+	(\-125|\-120|\-115|\-110|\-105|\-100|\-95|\-90|\-85|\-80|\-75|\-70|\-65|\-60|\-55|\-50)
+						# RxLevAccessMin
+	([[:blank:]]+)				# Pad
+	(\-53|\-51|\-49|\-47|\-45|\-43|\-41|\-39|\-37|\-35|\-33|\-31|\-29|\-27|\-25|\-23)
+						# AccessParameter
+	([[:blank:]]+)				# Pad
+	(DISABLE|[[:digit:]]{3,4})		# RadioDLTimeout
+	([[:blank:]]+)				# Pad
+	(\-[[:digit:]]{2,3})			# RSSIThreshold
+	([[:blank:]]+)				# Pad
+	([[:digit:]]{1,5})			# CCKIdSCKVerNr
+	([[:blank:]]+)				# Pad
+	([[:digit:]]{1,5})			# LocationArea
+	([[:blank:]]+)				# Pad
+	([(1|0)]{16})				# SubscriberClass
+	([[:blank:]]+)				# Pad
+	([(1|0)]{12})				# BSServiceDetails
+	([[:blank:]]+)				# Pad
+	(RANDOMIZE|IMMEDIATE|[[:digit:]]{1,2})	# IMM
+	([[:blank:]]+)				# Pad
+	([[:digit:]]{1,2})			# WT
+	([[:blank:]]+)				# Pad
+	([[:digit:]]{1,2})			# Nu
+	([[:blank:]]+)				# Pad
+	([0-1])					# FrameLngFctr
+	([[:blank:]]+)				# Pad
+	([[:digit:]]{1,2})			# TSPtr
+	([[:blank:]]+)				# Pad
+	([0-7])					# MinPriority
+	([[:blank:]]+)				# Pad
+	(PASS|TRUE|FAIL|FALSE)			# ExtdSrvcsEnabled
+	([[:blank:]]+)				# Pad
+	(.*)					# ConditionalFields
+    $$, '', 'xLMPQ');
+                       test_regex                       
+--------------------------------------------------------
+ {68,REG_UBOUNDS,REG_UNONPOSIX,REG_UUNPORT,REG_ULOCALE}
+(1 row)
+
+-- test reg-33.16.1 {Bug [8d2c0da36d]- another "in the wild" RE} {
+--     lindex [regexp -about "^MRK:client1: =1339 14HKelly Talisman 10011000 (\[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]*) \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* 8 0 8 0 0 0 77 77 1 1 2 0 11 { 1 3 8 \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* 00000000 1 13HC6 My Creator 2 3 8 \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* 00000000 1 31HC7 Slightly offensive name, huh 3 8 8 \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* 00000000 1 23HE-mail:kelly@hotbox.com 4 9 8 \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* 00000000 1 17Hcompface must die 5 10 8 \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* 00000000 0 3HAir 6 12 8 \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* 00000000 1 14HPGP public key 7 13 8 \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* 00000000 1 16Hkelly@hotbox.com 8 30 8 \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* 00000000 0 12H2 text/plain 9 30 8 \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* 00000000 0 13H2 x-kom/basic 10 33 8 \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* 00000000 1 1H0 11 14 8 \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* 00000000 1 1H3 }\r?"] 0
+-- } 1
+select * from test_regex(E'^MRK:client1: =1339 14HKelly Talisman 10011000 ([0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]*) [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* 8 0 8 0 0 0 77 77 1 1 2 0 11 { 1 3 8 [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* 00000000 1 13HC6 My Creator 2 3 8 [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* 00000000 1 31HC7 Slightly offensive name, huh 3 8 8 [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* 00000000 1 23HE-mail:kelly@hotbox.com 4 9 8 [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* 00000000 1 17Hcompface must die 5 10 8 [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* 00000000 0 3HAir 6 12 8 [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* 00000000 1 14HPGP public key 7 13 8 [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* 00000000 1 16Hkelly@hotbox.com 8 30 8 [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* 00000000 0 12H2 text/plain 9 30 8 [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* 00000000 0 13H2 x-kom/basic 10 33 8 [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* 00000000 1 1H0 11 14 8 [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* 00000000 1 1H3 }\r?', '', 'BMS');
+               test_regex                
+-----------------------------------------
+ {1,REG_UBRACES,REG_UUNSPEC,REG_UUNPORT}
+(1 row)
+
+-- test reg-33.15 {constraint fixes} {
+--     regexp {(^)+^} x
+-- } 1
+select * from test_regex('(^)+^', 'x', 'N');
+     test_regex      
+---------------------
+ {1,REG_UEMPTYMATCH}
+ {"",""}
+(2 rows)
+
+-- test reg-33.16 {constraint fixes} {
+--     regexp {($^)+} x
+-- } 0
+select * from test_regex('($^)+', 'x', 'N');
+     test_regex      
+---------------------
+ {1,REG_UEMPTYMATCH}
+(1 row)
+
+-- test reg-33.17 {constraint fixes} {
+--     regexp {(^$)*} x
+-- } 1
+select * from test_regex('(^$)*', 'x', 'N');
+     test_regex      
+---------------------
+ {1,REG_UEMPTYMATCH}
+ {"",NULL}
+(2 rows)
+
+-- test reg-33.18 {constraint fixes} {
+--     regexp {(^(?!aa))+} {aa bb cc}
+-- } 0
+select * from test_regex('(^(?!aa))+', 'aa bb cc', 'HP');
+            test_regex             
+-----------------------------------
+ {1,REG_ULOOKAROUND,REG_UNONPOSIX}
+(1 row)
+
+-- test reg-33.19 {constraint fixes} {
+--     regexp {(^(?!aa)(?!bb)(?!cc))+} {aa x}
+-- } 0
+select * from test_regex('(^(?!aa)(?!bb)(?!cc))+', 'aa x', 'HP');
+            test_regex             
+-----------------------------------
+ {1,REG_ULOOKAROUND,REG_UNONPOSIX}
+(1 row)
+
+-- test reg-33.20 {constraint fixes} {
+--     regexp {(^(?!aa)(?!bb)(?!cc))+} {bb x}
+-- } 0
+select * from test_regex('(^(?!aa)(?!bb)(?!cc))+', 'bb x', 'HP');
+            test_regex             
+-----------------------------------
+ {1,REG_ULOOKAROUND,REG_UNONPOSIX}
+(1 row)
+
+-- test reg-33.21 {constraint fixes} {
+--     regexp {(^(?!aa)(?!bb)(?!cc))+} {cc x}
+-- } 0
+select * from test_regex('(^(?!aa)(?!bb)(?!cc))+', 'cc x', 'HP');
+            test_regex             
+-----------------------------------
+ {1,REG_ULOOKAROUND,REG_UNONPOSIX}
+(1 row)
+
+-- test reg-33.22 {constraint fixes} {
+--     regexp {(^(?!aa)(?!bb)(?!cc))+} {dd x}
+-- } 1
+select * from test_regex('(^(?!aa)(?!bb)(?!cc))+', 'dd x', 'HP');
+            test_regex             
+-----------------------------------
+ {1,REG_ULOOKAROUND,REG_UNONPOSIX}
+ {"",""}
+(2 rows)
+
+-- test reg-33.23 {} {
+--     regexp {abcd(\m)+xyz} x
+-- } 0
+select * from test_regex('abcd(\m)+xyz', 'x', 'ILP');
+                  test_regex                   
+-----------------------------------------------
+ {1,REG_UNONPOSIX,REG_ULOCALE,REG_UIMPOSSIBLE}
+(1 row)
+
+-- test reg-33.24 {} {
+--     regexp {abcd(\m)+xyz} a
+-- } 0
+select * from test_regex('abcd(\m)+xyz', 'a', 'ILP');
+                  test_regex                   
+-----------------------------------------------
+ {1,REG_UNONPOSIX,REG_ULOCALE,REG_UIMPOSSIBLE}
+(1 row)
+
+-- test reg-33.25 {} {
+--     regexp {^abcd*(((((^(a c(e?d)a+|)+|)+|)+|)+|a)+|)} x
+-- } 0
+select * from test_regex('^abcd*(((((^(a c(e?d)a+|)+|)+|)+|)+|a)+|)', 'x', 'S');
+   test_regex    
+-----------------
+ {7,REG_UUNSPEC}
+(1 row)
+
+-- test reg-33.26 {} {
+--     regexp {a^(^)bcd*xy(((((($a+|)+|)+|)+$|)+|)+|)^$} x
+-- } 0
+select * from test_regex('a^(^)bcd*xy(((((($a+|)+|)+|)+$|)+|)+|)^$', 'x', 'IS');
+           test_regex            
+---------------------------------
+ {7,REG_UUNSPEC,REG_UIMPOSSIBLE}
+(1 row)
+
+-- test reg-33.27 {} {
+--     regexp {xyz(\Y\Y)+} x
+-- } 0
+select * from test_regex('xyz(\Y\Y)+', 'x', 'LP');
+          test_regex           
+-------------------------------
+ {1,REG_UNONPOSIX,REG_ULOCALE}
+(1 row)
+
+-- test reg-33.28 {} {
+--     regexp {x|(?:\M)+} x
+-- } 1
+select * from test_regex('x|(?:\M)+', 'x', 'LNP');
+                  test_regex                   
+-----------------------------------------------
+ {0,REG_UNONPOSIX,REG_ULOCALE,REG_UEMPTYMATCH}
+ {x}
+(2 rows)
+
+-- test reg-33.29 {} {
+--     # This is near the limits of the RE engine
+--     regexp [string repeat x*y*z* 480] x
+-- } 1
+-- The runtime cost of this seems out of proportion to the value,
+-- so for Postgres purposes reduce the repeat to 200x
+select * from test_regex(repeat('x*y*z*', 200), 'x', 'N');
+     test_regex      
+---------------------
+ {0,REG_UEMPTYMATCH}
+ {x}
+(2 rows)
+
+-- test reg-33.30 {Bug 1080042} {
+--     regexp {(\Y)+} foo
+-- } 1
+select * from test_regex('(\Y)+', 'foo', 'LNP');
+                  test_regex                   
+-----------------------------------------------
+ {1,REG_UNONPOSIX,REG_ULOCALE,REG_UEMPTYMATCH}
+ {"",""}
+(2 rows)
+
diff --git a/src/test/modules/test_regex/expected/test_regex_utf8.out b/src/test/modules/test_regex/expected/test_regex_utf8.out
new file mode 100644
index 0000000000..112698ac61
--- /dev/null
+++ b/src/test/modules/test_regex/expected/test_regex_utf8.out
@@ -0,0 +1,100 @@
+/*
+ * This test must be run in a database with UTF-8 encoding,
+ * because other encodings don't support all the characters used.
+ */
+SELECT getdatabaseencoding() <> 'UTF8'
+       AS skip_test \gset
+\if :skip_test
+\quit
+\endif
+set client_encoding = utf8;
+set standard_conforming_strings = on;
+-- Run the Tcl test cases that require Unicode
+-- expectMatch	9.44 EMP*	{a[\u00fe-\u0507][\u00ff-\u0300]b} \
+-- 	"a\u0102\u02ffb"	"a\u0102\u02ffb"
+select * from test_regex('a[\u00fe-\u0507][\u00ff-\u0300]b', E'a\u0102\u02ffb', 'EMP*');
+               test_regex               
+----------------------------------------
+ {0,REG_UBBS,REG_UNONPOSIX,REG_UUNPORT}
+ {aĂ˿b}
+(2 rows)
+
+-- expectMatch	13.27 P		"a\\U00001234x"	"a\u1234x"	"a\u1234x"
+select * from test_regex('a\U00001234x', E'a\u1234x', 'P');
+    test_regex     
+-------------------
+ {0,REG_UNONPOSIX}
+ {aሴx}
+(2 rows)
+
+-- expectMatch	13.28 P		{a\U00001234x}	"a\u1234x"	"a\u1234x"
+select * from test_regex('a\U00001234x', E'a\u1234x', 'P');
+    test_regex     
+-------------------
+ {0,REG_UNONPOSIX}
+ {aሴx}
+(2 rows)
+
+-- expectMatch	13.29 P		"a\\U0001234x"	"a\u1234x"	"a\u1234x"
+-- Tcl has relaxed their code to allow 1-8 hex digits, but Postgres hasn't
+select * from test_regex('a\U0001234x', E'a\u1234x', 'P');
+ERROR:  invalid regular expression: invalid escape \ sequence
+-- expectMatch	13.30 P		{a\U0001234x}	"a\u1234x"	"a\u1234x"
+-- Tcl has relaxed their code to allow 1-8 hex digits, but Postgres hasn't
+select * from test_regex('a\U0001234x', E'a\u1234x', 'P');
+ERROR:  invalid regular expression: invalid escape \ sequence
+-- expectMatch	13.31 P		"a\\U000012345x"	"a\u12345x"	"a\u12345x"
+select * from test_regex('a\U000012345x', E'a\u12345x', 'P');
+    test_regex     
+-------------------
+ {0,REG_UNONPOSIX}
+ {aሴ5x}
+(2 rows)
+
+-- expectMatch	13.32 P		{a\U000012345x}	"a\u12345x"	"a\u12345x"
+select * from test_regex('a\U000012345x', E'a\u12345x', 'P');
+    test_regex     
+-------------------
+ {0,REG_UNONPOSIX}
+ {aሴ5x}
+(2 rows)
+
+-- expectMatch	13.33 P		"a\\U1000000x"	"a\ufffd0x"	"a\ufffd0x"
+-- Tcl allows this as a standalone character, but Postgres doesn't
+select * from test_regex('a\U1000000x', E'a\ufffd0x', 'P');
+ERROR:  invalid regular expression: invalid escape \ sequence
+-- expectMatch	13.34 P		{a\U1000000x}	"a\ufffd0x"	"a\ufffd0x"
+-- Tcl allows this as a standalone character, but Postgres doesn't
+select * from test_regex('a\U1000000x', E'a\ufffd0x', 'P');
+ERROR:  invalid regular expression: invalid escape \ sequence
+-- Additional tests, not derived from Tcl
+-- Exercise logic around high character ranges a bit more
+select * from test_regex('a
+  [\u1000-\u1100]*
+  [\u3000-\u3100]*
+  [\u1234-\u25ff]+
+  [\u2000-\u35ff]*
+  [\u2600-\u2f00]*
+  \u1236\u1236x',
+  E'a\u1234\u1236\u1236x', 'xEMP');
+               test_regex               
+----------------------------------------
+ {0,REG_UBBS,REG_UNONPOSIX,REG_UUNPORT}
+ {aሴሶሶx}
+(2 rows)
+
+select * from test_regex('[[:alnum:]]*[[:upper:]]*[\u1000-\u2000]*\u1237',
+  E'\u1500\u1237', 'ELMP');
+                     test_regex                     
+----------------------------------------------------
+ {0,REG_UBBS,REG_UNONPOSIX,REG_UUNPORT,REG_ULOCALE}
+ {ᔀሷ}
+(2 rows)
+
+select * from test_regex('[[:alnum:]]*[[:upper:]]*[\u1000-\u2000]*\u1237',
+  E'A\u1239', 'ELMP');
+                     test_regex                     
+----------------------------------------------------
+ {0,REG_UBBS,REG_UNONPOSIX,REG_UUNPORT,REG_ULOCALE}
+(1 row)
+
diff --git a/src/test/modules/test_regex/expected/test_regex_utf8_1.out b/src/test/modules/test_regex/expected/test_regex_utf8_1.out
new file mode 100644
index 0000000000..37aead89c0
--- /dev/null
+++ b/src/test/modules/test_regex/expected/test_regex_utf8_1.out
@@ -0,0 +1,8 @@
+/*
+ * This test must be run in a database with UTF-8 encoding,
+ * because other encodings don't support all the characters used.
+ */
+SELECT getdatabaseencoding() <> 'UTF8'
+       AS skip_test \gset
+\if :skip_test
+\quit
diff --git a/src/test/modules/test_regex/sql/test_regex.sql b/src/test/modules/test_regex/sql/test_regex.sql
new file mode 100644
index 0000000000..272dfc0cd6
--- /dev/null
+++ b/src/test/modules/test_regex/sql/test_regex.sql
@@ -0,0 +1,1667 @@
+-- This file is based on tests/reg.test from the Tcl distribution,
+-- which is marked
+-- # Copyright (c) 1998, 1999 Henry Spencer.  All rights reserved.
+-- The full copyright notice can be found in src/backend/regex/COPYRIGHT.
+-- Most commented lines below are copied from reg.test.  Each
+-- test case is followed by an equivalent test using test_regex().
+
+create extension test_regex;
+
+set standard_conforming_strings = on;
+
+-- # support functions and preliminary misc.
+-- # This is sensitive to changes in message wording, but we really have to
+-- # test the code->message expansion at least once.
+-- ::tcltest::test reg-0.1 "regexp error reporting" {
+--     list [catch {regexp (*) ign} msg] $msg
+-- } {1 {couldn't compile regular expression pattern: quantifier operand invalid}}
+select * from test_regex('(*)', '', '');
+
+-- doing 1 "basic sanity checks"
+
+-- expectMatch	1.1 &		abc	abc		abc
+select * from test_regex('abc', 'abc', '');
+select * from test_regex('abc', 'abc', 'b');
+-- expectNomatch	1.2 &		abc	def
+select * from test_regex('abc', 'def', '');
+select * from test_regex('abc', 'def', 'b');
+-- expectMatch	1.3 &		abc	xyabxabce	abc
+select * from test_regex('abc', 'xyabxabce', '');
+select * from test_regex('abc', 'xyabxabce', 'b');
+
+-- doing 2 "invalid option combinations"
+
+-- expectError	2.1 qe		a	INVARG
+select * from test_regex('a', '', 'qe');
+-- expectError	2.2 qa		a	INVARG
+select * from test_regex('a', '', 'qa');
+-- expectError	2.3 qx		a	INVARG
+select * from test_regex('a', '', 'qx');
+-- expectError	2.4 qn		a	INVARG
+select * from test_regex('a', '', 'qn');
+-- expectError	2.5 ba		a	INVARG
+select * from test_regex('a', '', 'ba');
+
+-- doing 3 "basic syntax"
+
+-- expectIndices	3.1 &NS		""	a	{0 -1}
+select * from test_regex('', 'a', '0NS');
+select * from test_regex('', 'a', '0NSb');
+-- expectMatch	3.2 NS		a|	a	a
+select * from test_regex('a|', 'a', 'NS');
+-- expectMatch	3.3 -		a|b	a	a
+select * from test_regex('a|b', 'a', '-');
+-- expectMatch	3.4 -		a|b	b	b
+select * from test_regex('a|b', 'b', '-');
+-- expectMatch	3.5 NS		a||b	b	b
+select * from test_regex('a||b', 'b', 'NS');
+-- expectMatch	3.6 &		ab	ab	ab
+select * from test_regex('ab', 'ab', '');
+select * from test_regex('ab', 'ab', 'b');
+
+-- doing 4 "parentheses"
+
+-- expectMatch	4.1  -		(a)e		ae	ae	a
+select * from test_regex('(a)e', 'ae', '-');
+-- expectMatch	4.2  o		(a)e		ae
+select * from test_regex('(a)e', 'ae', 'o');
+-- expectMatch	4.3  b		{\(a\)b}	ab	ab	a
+select * from test_regex('\(a\)b', 'ab', 'b');
+-- expectMatch	4.4  -		a((b)c)		abc	abc	bc	b
+select * from test_regex('a((b)c)', 'abc', '-');
+-- expectMatch	4.5  -		a(b)(c)		abc	abc	b	c
+select * from test_regex('a(b)(c)', 'abc', '-');
+-- expectError	4.6  -		a(b		EPAREN
+select * from test_regex('a(b', '', '-');
+-- expectError	4.7  b		{a\(b}		EPAREN
+select * from test_regex('a\(b', '', 'b');
+-- # sigh, we blew it on the specs here... someday this will be fixed in POSIX,
+-- #  but meanwhile, it's fixed in AREs
+-- expectMatch	4.8  eU		a)b		a)b	a)b
+select * from test_regex('a)b', 'a)b', 'eU');
+-- expectError	4.9  -		a)b		EPAREN
+select * from test_regex('a)b', '', '-');
+-- expectError	4.10 b		{a\)b}		EPAREN
+select * from test_regex('a\)b', '', 'b');
+-- expectMatch	4.11 P		a(?:b)c		abc	abc
+select * from test_regex('a(?:b)c', 'abc', 'P');
+-- expectError	4.12 e		a(?:b)c		BADRPT
+select * from test_regex('a(?:b)c', '', 'e');
+-- expectIndices	4.13 S		a()b		ab	{0 1}	{1 0}
+select * from test_regex('a()b', 'ab', '0S');
+-- expectMatch	4.14 SP		a(?:)b		ab	ab
+select * from test_regex('a(?:)b', 'ab', 'SP');
+-- expectIndices	4.15 S		a(|b)c		ac	{0 1}	{1 0}
+select * from test_regex('a(|b)c', 'ac', '0S');
+-- expectMatch	4.16 S		a(b|)c		abc	abc	b
+select * from test_regex('a(b|)c', 'abc', 'S');
+
+-- doing 5 "simple one-char matching"
+-- # general case of brackets done later
+
+-- expectMatch	5.1 &		a.b		axb	axb
+select * from test_regex('a.b', 'axb', '');
+select * from test_regex('a.b', 'axb', 'b');
+-- expectNomatch	5.2 &n		"a.b"		"a\nb"
+select * from test_regex('a.b', E'a\nb', 'n');
+select * from test_regex('a.b', E'a\nb', 'nb');
+-- expectMatch	5.3 &		{a[bc]d}	abd	abd
+select * from test_regex('a[bc]d', 'abd', '');
+select * from test_regex('a[bc]d', 'abd', 'b');
+-- expectMatch	5.4 &		{a[bc]d}	acd	acd
+select * from test_regex('a[bc]d', 'acd', '');
+select * from test_regex('a[bc]d', 'acd', 'b');
+-- expectNomatch	5.5 &		{a[bc]d}	aed
+select * from test_regex('a[bc]d', 'aed', '');
+select * from test_regex('a[bc]d', 'aed', 'b');
+-- expectNomatch	5.6 &		{a[^bc]d}	abd
+select * from test_regex('a[^bc]d', 'abd', '');
+select * from test_regex('a[^bc]d', 'abd', 'b');
+-- expectMatch	5.7 &		{a[^bc]d}	aed	aed
+select * from test_regex('a[^bc]d', 'aed', '');
+select * from test_regex('a[^bc]d', 'aed', 'b');
+-- expectNomatch	5.8 &p		"a\[^bc]d"	"a\nd"
+select * from test_regex('a[^bc]d', E'a\nd', 'p');
+select * from test_regex('a[^bc]d', E'a\nd', 'pb');
+
+-- doing 6 "context-dependent syntax"
+-- # plus odds and ends
+
+-- expectError	6.1  -		*	BADRPT
+select * from test_regex('*', '', '-');
+-- expectMatch	6.2  b		*	*	*
+select * from test_regex('*', '*', 'b');
+-- expectMatch	6.3  b		{\(*\)}	*	*	*
+select * from test_regex('\(*\)', '*', 'b');
+-- expectError	6.4  -		(*)	BADRPT
+select * from test_regex('(*)', '', '-');
+-- expectMatch	6.5  b		^*	*	*
+select * from test_regex('^*', '*', 'b');
+-- expectError	6.6  -		^*	BADRPT
+select * from test_regex('^*', '', '-');
+-- expectNomatch	6.7  &		^b	^b
+select * from test_regex('^b', '^b', '');
+select * from test_regex('^b', '^b', 'b');
+-- expectMatch	6.8  b		x^	x^	x^
+select * from test_regex('x^', 'x^', 'b');
+-- expectNomatch	6.9  I		x^	x
+select * from test_regex('x^', 'x', 'I');
+-- expectMatch	6.10 n		"\n^"	"x\nb"	"\n"
+select * from test_regex(E'\n^', E'x\nb', 'n');
+-- expectNomatch	6.11 bS		{\(^b\)} ^b
+select * from test_regex('\(^b\)', '^b', 'bS');
+-- expectMatch	6.12 -		(^b)	b	b	b
+select * from test_regex('(^b)', 'b', '-');
+-- expectMatch	6.13 &		{x$}	x	x
+select * from test_regex('x$', 'x', '');
+select * from test_regex('x$', 'x', 'b');
+-- expectMatch	6.14 bS		{\(x$\)} x	x	x
+select * from test_regex('\(x$\)', 'x', 'bS');
+-- expectMatch	6.15 -		{(x$)}	x	x	x
+select * from test_regex('(x$)', 'x', '-');
+-- expectMatch	6.16 b		{x$y}	"x\$y"	"x\$y"
+select * from test_regex('x$y', 'x$y', 'b');
+-- expectNomatch	6.17 I		{x$y}	xy
+select * from test_regex('x$y', 'xy', 'I');
+-- expectMatch	6.18 n		"x\$\n"	"x\n"	"x\n"
+select * from test_regex(E'x$\n', E'x\n', 'n');
+-- expectError	6.19 -		+	BADRPT
+select * from test_regex('+', '', '-');
+-- expectError	6.20 -		?	BADRPT
+select * from test_regex('?', '', '-');
+
+-- These two are not yet incorporated in Tcl, cf
+-- https://core.tcl-lang.org/tcl/artifact/106269fa65d96b83
+-- expectError	6.21 -		{x(\w)(?=(\1))}	ESUBREG
+select * from test_regex('x(\w)(?=(\1))', '', '-');
+-- expectMatch	6.22 HP		{x(?=((foo)))}	xfoo	x
+select * from test_regex('x(?=((foo)))', 'xfoo', 'HP');
+
+-- doing 7 "simple quantifiers"
+
+-- expectMatch	7.1  &N		a*	aa	aa
+select * from test_regex('a*', 'aa', 'N');
+select * from test_regex('a*', 'aa', 'Nb');
+-- expectIndices	7.2  &N		a*	b	{0 -1}
+select * from test_regex('a*', 'b', '0N');
+select * from test_regex('a*', 'b', '0Nb');
+-- expectMatch	7.3  -		a+	aa	aa
+select * from test_regex('a+', 'aa', '-');
+-- expectMatch	7.4  -		a?b	ab	ab
+select * from test_regex('a?b', 'ab', '-');
+-- expectMatch	7.5  -		a?b	b	b
+select * from test_regex('a?b', 'b', '-');
+-- expectError	7.6  -		**	BADRPT
+select * from test_regex('**', '', '-');
+-- expectMatch	7.7  bN		**	***	***
+select * from test_regex('**', '***', 'bN');
+-- expectError	7.8  &		a**	BADRPT
+select * from test_regex('a**', '', '');
+select * from test_regex('a**', '', 'b');
+-- expectError	7.9  &		a**b	BADRPT
+select * from test_regex('a**b', '', '');
+select * from test_regex('a**b', '', 'b');
+-- expectError	7.10 &		***	BADRPT
+select * from test_regex('***', '', '');
+select * from test_regex('***', '', 'b');
+-- expectError	7.11 -		a++	BADRPT
+select * from test_regex('a++', '', '-');
+-- expectError	7.12 -		a?+	BADRPT
+select * from test_regex('a?+', '', '-');
+-- expectError	7.13 -		a?*	BADRPT
+select * from test_regex('a?*', '', '-');
+-- expectError	7.14 -		a+*	BADRPT
+select * from test_regex('a+*', '', '-');
+-- expectError	7.15 -		a*+	BADRPT
+select * from test_regex('a*+', '', '-');
+
+-- doing 8 "braces"
+
+-- expectMatch	8.1  NQ		"a{0,1}"	""	""
+select * from test_regex('a{0,1}', '', 'NQ');
+-- expectMatch	8.2  NQ		"a{0,1}"	ac	a
+select * from test_regex('a{0,1}', 'ac', 'NQ');
+-- expectError	8.3  -		"a{1,0}"	BADBR
+select * from test_regex('a{1,0}', '', '-');
+-- expectError	8.4  -		"a{1,2,3}"	BADBR
+select * from test_regex('a{1,2,3}', '', '-');
+-- expectError	8.5  -		"a{257}"	BADBR
+select * from test_regex('a{257}', '', '-');
+-- expectError	8.6  -		"a{1000}"	BADBR
+select * from test_regex('a{1000}', '', '-');
+-- expectError	8.7  -		"a{1"		EBRACE
+select * from test_regex('a{1', '', '-');
+-- expectError	8.8  -		"a{1n}"		BADBR
+select * from test_regex('a{1n}', '', '-');
+-- expectMatch	8.9  BS		"a{b"		"a\{b"	"a\{b"
+select * from test_regex('a{b', 'a{b', 'BS');
+-- expectMatch	8.10 BS		"a{"		"a\{"	"a\{"
+select * from test_regex('a{', 'a{', 'BS');
+-- expectMatch	8.11 bQ		"a\\{0,1\\}b"	cb	b
+select * from test_regex('a\{0,1\}b', 'cb', 'bQ');
+-- expectError	8.12 b		"a\\{0,1"	EBRACE
+select * from test_regex('a\{0,1', '', 'b');
+-- expectError	8.13 -		"a{0,1\\"	BADBR
+select * from test_regex('a{0,1\', '', '-');
+-- expectMatch	8.14 Q		"a{0}b"		ab	b
+select * from test_regex('a{0}b', 'ab', 'Q');
+-- expectMatch	8.15 Q		"a{0,0}b"	ab	b
+select * from test_regex('a{0,0}b', 'ab', 'Q');
+-- expectMatch	8.16 Q		"a{0,1}b"	ab	ab
+select * from test_regex('a{0,1}b', 'ab', 'Q');
+-- expectMatch	8.17 Q		"a{0,2}b"	b	b
+select * from test_regex('a{0,2}b', 'b', 'Q');
+-- expectMatch	8.18 Q		"a{0,2}b"	aab	aab
+select * from test_regex('a{0,2}b', 'aab', 'Q');
+-- expectMatch	8.19 Q		"a{0,}b"	aab	aab
+select * from test_regex('a{0,}b', 'aab', 'Q');
+-- expectMatch	8.20 Q		"a{1,1}b"	aab	ab
+select * from test_regex('a{1,1}b', 'aab', 'Q');
+-- expectMatch	8.21 Q		"a{1,3}b"	aaaab	aaab
+select * from test_regex('a{1,3}b', 'aaaab', 'Q');
+-- expectNomatch	8.22 Q		"a{1,3}b"	b
+select * from test_regex('a{1,3}b', 'b', 'Q');
+-- expectMatch	8.23 Q		"a{1,}b"	aab	aab
+select * from test_regex('a{1,}b', 'aab', 'Q');
+-- expectNomatch	8.24 Q		"a{2,3}b"	ab
+select * from test_regex('a{2,3}b', 'ab', 'Q');
+-- expectMatch	8.25 Q		"a{2,3}b"	aaaab	aaab
+select * from test_regex('a{2,3}b', 'aaaab', 'Q');
+-- expectNomatch	8.26 Q		"a{2,}b"	ab
+select * from test_regex('a{2,}b', 'ab', 'Q');
+-- expectMatch	8.27 Q		"a{2,}b"	aaaab	aaaab
+select * from test_regex('a{2,}b', 'aaaab', 'Q');
+
+-- doing 9 "brackets"
+
+-- expectMatch	9.1  &		{a[bc]}		ac	ac
+select * from test_regex('a[bc]', 'ac', '');
+select * from test_regex('a[bc]', 'ac', 'b');
+-- expectMatch	9.2  &		{a[-]}		a-	a-
+select * from test_regex('a[-]', 'a-', '');
+select * from test_regex('a[-]', 'a-', 'b');
+-- expectMatch	9.3  &		{a[[.-.]]}	a-	a-
+select * from test_regex('a[[.-.]]', 'a-', '');
+select * from test_regex('a[[.-.]]', 'a-', 'b');
+-- expectMatch	9.4  &L		{a[[.zero.]]}	a0	a0
+select * from test_regex('a[[.zero.]]', 'a0', 'L');
+select * from test_regex('a[[.zero.]]', 'a0', 'Lb');
+-- expectMatch	9.5  &LM	{a[[.zero.]-9]}	a2	a2
+select * from test_regex('a[[.zero.]-9]', 'a2', 'LM');
+select * from test_regex('a[[.zero.]-9]', 'a2', 'LMb');
+-- expectMatch	9.6  &M		{a[0-[.9.]]}	a2	a2
+select * from test_regex('a[0-[.9.]]', 'a2', 'M');
+select * from test_regex('a[0-[.9.]]', 'a2', 'Mb');
+-- expectMatch	9.7  &+L	{a[[=x=]]}	ax	ax
+select * from test_regex('a[[=x=]]', 'ax', '+L');
+select * from test_regex('a[[=x=]]', 'ax', '+Lb');
+-- expectMatch	9.8  &+L	{a[[=x=]]}	ay	ay
+select * from test_regex('a[[=x=]]', 'ay', '+L');
+select * from test_regex('a[[=x=]]', 'ay', '+Lb');
+-- expectNomatch	9.9  &+L	{a[[=x=]]}	az
+select * from test_regex('a[[=x=]]', 'az', '+L');
+select * from test_regex('a[[=x=]]', 'az', '+Lb');
+-- expectError	9.10 &		{a[0-[=x=]]}	ERANGE
+select * from test_regex('a[0-[=x=]]', '', '');
+select * from test_regex('a[0-[=x=]]', '', 'b');
+-- expectMatch	9.11 &L		{a[[:digit:]]}	a0	a0
+select * from test_regex('a[[:digit:]]', 'a0', 'L');
+select * from test_regex('a[[:digit:]]', 'a0', 'Lb');
+-- expectError	9.12 &		{a[[:woopsie:]]}	ECTYPE
+select * from test_regex('a[[:woopsie:]]', '', '');
+select * from test_regex('a[[:woopsie:]]', '', 'b');
+-- expectNomatch	9.13 &L		{a[[:digit:]]}	ab
+select * from test_regex('a[[:digit:]]', 'ab', 'L');
+select * from test_regex('a[[:digit:]]', 'ab', 'Lb');
+-- expectError	9.14 &		{a[0-[:digit:]]}	ERANGE
+select * from test_regex('a[0-[:digit:]]', '', '');
+select * from test_regex('a[0-[:digit:]]', '', 'b');
+-- expectMatch	9.15 &LP	{[[:<:]]a}	a	a
+select * from test_regex('[[:<:]]a', 'a', 'LP');
+select * from test_regex('[[:<:]]a', 'a', 'LPb');
+-- expectMatch	9.16 &LP	{a[[:>:]]}	a	a
+select * from test_regex('a[[:>:]]', 'a', 'LP');
+select * from test_regex('a[[:>:]]', 'a', 'LPb');
+-- expectError	9.17 &		{a[[..]]b}	ECOLLATE
+select * from test_regex('a[[..]]b', '', '');
+select * from test_regex('a[[..]]b', '', 'b');
+-- expectError	9.18 &		{a[[==]]b}	ECOLLATE
+select * from test_regex('a[[==]]b', '', '');
+select * from test_regex('a[[==]]b', '', 'b');
+-- expectError	9.19 &		{a[[::]]b}	ECTYPE
+select * from test_regex('a[[::]]b', '', '');
+select * from test_regex('a[[::]]b', '', 'b');
+-- expectError	9.20 &		{a[[.a}		EBRACK
+select * from test_regex('a[[.a', '', '');
+select * from test_regex('a[[.a', '', 'b');
+-- expectError	9.21 &		{a[[=a}		EBRACK
+select * from test_regex('a[[=a', '', '');
+select * from test_regex('a[[=a', '', 'b');
+-- expectError	9.22 &		{a[[:a}		EBRACK
+select * from test_regex('a[[:a', '', '');
+select * from test_regex('a[[:a', '', 'b');
+-- expectError	9.23 &		{a[}		EBRACK
+select * from test_regex('a[', '', '');
+select * from test_regex('a[', '', 'b');
+-- expectError	9.24 &		{a[b}		EBRACK
+select * from test_regex('a[b', '', '');
+select * from test_regex('a[b', '', 'b');
+-- expectError	9.25 &		{a[b-}		EBRACK
+select * from test_regex('a[b-', '', '');
+select * from test_regex('a[b-', '', 'b');
+-- expectError	9.26 &		{a[b-c}		EBRACK
+select * from test_regex('a[b-c', '', '');
+select * from test_regex('a[b-c', '', 'b');
+-- expectMatch	9.27 &M		{a[b-c]}	ab	ab
+select * from test_regex('a[b-c]', 'ab', 'M');
+select * from test_regex('a[b-c]', 'ab', 'Mb');
+-- expectMatch	9.28 &		{a[b-b]}	ab	ab
+select * from test_regex('a[b-b]', 'ab', '');
+select * from test_regex('a[b-b]', 'ab', 'b');
+-- expectMatch	9.29 &M		{a[1-2]}	a2	a2
+select * from test_regex('a[1-2]', 'a2', 'M');
+select * from test_regex('a[1-2]', 'a2', 'Mb');
+-- expectError	9.30 &		{a[c-b]}	ERANGE
+select * from test_regex('a[c-b]', '', '');
+select * from test_regex('a[c-b]', '', 'b');
+-- expectError	9.31 &		{a[a-b-c]}	ERANGE
+select * from test_regex('a[a-b-c]', '', '');
+select * from test_regex('a[a-b-c]', '', 'b');
+-- expectMatch	9.32 &M		{a[--?]b}	a?b	a?b
+select * from test_regex('a[--?]b', 'a?b', 'M');
+select * from test_regex('a[--?]b', 'a?b', 'Mb');
+-- expectMatch	9.33 &		{a[---]b}	a-b	a-b
+select * from test_regex('a[---]b', 'a-b', '');
+select * from test_regex('a[---]b', 'a-b', 'b');
+-- expectMatch	9.34 &		{a[]b]c}	a]c	a]c
+select * from test_regex('a[]b]c', 'a]c', '');
+select * from test_regex('a[]b]c', 'a]c', 'b');
+-- expectMatch	9.35 EP		{a[\]]b}	a]b	a]b
+select * from test_regex('a[\]]b', 'a]b', 'EP');
+-- expectNomatch	9.36 bE		{a[\]]b}	a]b
+select * from test_regex('a[\]]b', 'a]b', 'bE');
+-- expectMatch	9.37 bE		{a[\]]b}	"a\\]b"	"a\\]b"
+select * from test_regex('a[\]]b', 'a\]b', 'bE');
+-- expectMatch	9.38 eE		{a[\]]b}	"a\\]b"	"a\\]b"
+select * from test_regex('a[\]]b', 'a\]b', 'eE');
+-- expectMatch	9.39 EP		{a[\\]b}	"a\\b"	"a\\b"
+select * from test_regex('a[\\]b', 'a\b', 'EP');
+-- expectMatch	9.40 eE		{a[\\]b}	"a\\b"	"a\\b"
+select * from test_regex('a[\\]b', 'a\b', 'eE');
+-- expectMatch	9.41 bE		{a[\\]b}	"a\\b"	"a\\b"
+select * from test_regex('a[\\]b', 'a\b', 'bE');
+-- expectError	9.42 -		{a[\Z]b}	EESCAPE
+select * from test_regex('a[\Z]b', '', '-');
+-- expectMatch	9.43 &		{a[[b]c}	"a\[c"	"a\[c"
+select * from test_regex('a[[b]c', 'a[c', '');
+select * from test_regex('a[[b]c', 'a[c', 'b');
+-- This only works in UTF8 encoding, so it's moved to test_regex_utf8.sql:
+-- expectMatch	9.44 EMP*	{a[\u00fe-\u0507][\u00ff-\u0300]b} \
+-- 	"a\u0102\u02ffb"	"a\u0102\u02ffb"
+
+-- doing 10 "anchors and newlines"
+
+-- expectMatch	10.1  &		^a	a	a
+select * from test_regex('^a', 'a', '');
+select * from test_regex('^a', 'a', 'b');
+-- expectNomatch	10.2  &^	^a	a
+select * from test_regex('^a', 'a', '^');
+select * from test_regex('^a', 'a', '^b');
+-- expectIndices	10.3  &N	^	a	{0 -1}
+select * from test_regex('^', 'a', '0N');
+select * from test_regex('^', 'a', '0Nb');
+-- expectIndices	10.4  &		{a$}	aba	{2 2}
+select * from test_regex('a$', 'aba', '0');
+select * from test_regex('a$', 'aba', '0b');
+-- expectNomatch	10.5  {&$}	{a$}	a
+select * from test_regex('a$', 'a', '$');
+select * from test_regex('a$', 'a', '$b');
+-- expectIndices	10.6  &N	{$}	ab	{2 1}
+select * from test_regex('$', 'ab', '0N');
+select * from test_regex('$', 'ab', '0Nb');
+-- expectMatch	10.7  &n	^a	a	a
+select * from test_regex('^a', 'a', 'n');
+select * from test_regex('^a', 'a', 'nb');
+-- expectMatch	10.8  &n	"^a"	"b\na"	"a"
+select * from test_regex('^a', E'b\na', 'n');
+select * from test_regex('^a', E'b\na', 'nb');
+-- expectIndices	10.9  &w	"^a"	"a\na"	{0 0}
+select * from test_regex('^a', E'a\na', '0w');
+select * from test_regex('^a', E'a\na', '0wb');
+-- expectIndices	10.10 &n^	"^a"	"a\na"	{2 2}
+select * from test_regex('^a', E'a\na', '0n^');
+select * from test_regex('^a', E'a\na', '0n^b');
+-- expectMatch	10.11 &n	{a$}	a	a
+select * from test_regex('a$', 'a', 'n');
+select * from test_regex('a$', 'a', 'nb');
+-- expectMatch	10.12 &n	"a\$"	"a\nb"	"a"
+select * from test_regex('a$', E'a\nb', 'n');
+select * from test_regex('a$', E'a\nb', 'nb');
+-- expectIndices	10.13 &n	"a\$"	"a\na"	{0 0}
+select * from test_regex('a$', E'a\na', '0n');
+select * from test_regex('a$', E'a\na', '0nb');
+-- expectIndices	10.14 N		^^	a	{0 -1}
+select * from test_regex('^^', 'a', '0N');
+-- expectMatch	10.15 b		^^	^	^
+select * from test_regex('^^', '^', 'b');
+-- expectIndices	10.16 N		{$$}	a	{1 0}
+select * from test_regex('$$', 'a', '0N');
+-- expectMatch	10.17 b		{$$}	"\$"	"\$"
+select * from test_regex('$$', '$', 'b');
+-- expectMatch	10.18 &N	{^$}	""	""
+select * from test_regex('^$', '', 'N');
+select * from test_regex('^$', '', 'Nb');
+-- expectNomatch	10.19 &N	{^$}	a
+select * from test_regex('^$', 'a', 'N');
+select * from test_regex('^$', 'a', 'Nb');
+-- expectIndices	10.20 &nN	"^\$"	a\n\nb	{2 1}
+select * from test_regex('^$', E'a\n\nb', '0nN');
+select * from test_regex('^$', E'a\n\nb', '0nNb');
+-- expectMatch	10.21 N		{$^}	""	""
+select * from test_regex('$^', '', 'N');
+-- expectMatch	10.22 b		{$^}	"\$^"	"\$^"
+select * from test_regex('$^', '$^', 'b');
+-- expectMatch	10.23 P		{\Aa}	a	a
+select * from test_regex('\Aa', 'a', 'P');
+-- expectMatch	10.24 ^P	{\Aa}	a	a
+select * from test_regex('\Aa', 'a', '^P');
+-- expectNomatch	10.25 ^nP	{\Aa}	"b\na"
+select * from test_regex('\Aa', E'b\na', '^nP');
+-- expectMatch	10.26 P		{a\Z}	a	a
+select * from test_regex('a\Z', 'a', 'P');
+-- expectMatch	10.27 \$P	{a\Z}	a	a
+select * from test_regex('a\Z', 'a', '$P');
+-- expectNomatch	10.28 \$nP	{a\Z}	"a\nb"
+select * from test_regex('a\Z', E'a\nb', '$nP');
+-- expectError	10.29 -		^*	BADRPT
+select * from test_regex('^*', '', '-');
+-- expectError	10.30 -		{$*}	BADRPT
+select * from test_regex('$*', '', '-');
+-- expectError	10.31 -		{\A*}	BADRPT
+select * from test_regex('\A*', '', '-');
+-- expectError	10.32 -		{\Z*}	BADRPT
+select * from test_regex('\Z*', '', '-');
+
+-- doing 11 "boundary constraints"
+
+-- expectMatch	11.1  &LP	{[[:<:]]a}	a	a
+select * from test_regex('[[:<:]]a', 'a', 'LP');
+select * from test_regex('[[:<:]]a', 'a', 'LPb');
+-- expectMatch	11.2  &LP	{[[:<:]]a}	-a	a
+select * from test_regex('[[:<:]]a', '-a', 'LP');
+select * from test_regex('[[:<:]]a', '-a', 'LPb');
+-- expectNomatch	11.3  &LP	{[[:<:]]a}	ba
+select * from test_regex('[[:<:]]a', 'ba', 'LP');
+select * from test_regex('[[:<:]]a', 'ba', 'LPb');
+-- expectMatch	11.4  &LP	{a[[:>:]]}	a	a
+select * from test_regex('a[[:>:]]', 'a', 'LP');
+select * from test_regex('a[[:>:]]', 'a', 'LPb');
+-- expectMatch	11.5  &LP	{a[[:>:]]}	a-	a
+select * from test_regex('a[[:>:]]', 'a-', 'LP');
+select * from test_regex('a[[:>:]]', 'a-', 'LPb');
+-- expectNomatch	11.6  &LP	{a[[:>:]]}	ab
+select * from test_regex('a[[:>:]]', 'ab', 'LP');
+select * from test_regex('a[[:>:]]', 'ab', 'LPb');
+-- expectMatch	11.7  bLP	{\<a}		a	a
+select * from test_regex('\<a', 'a', 'bLP');
+-- expectNomatch	11.8  bLP	{\<a}		ba
+select * from test_regex('\<a', 'ba', 'bLP');
+-- expectMatch	11.9  bLP	{a\>}		a	a
+select * from test_regex('a\>', 'a', 'bLP');
+-- expectNomatch	11.10 bLP	{a\>}		ab
+select * from test_regex('a\>', 'ab', 'bLP');
+-- expectMatch	11.11 LP	{\ya}		a	a
+select * from test_regex('\ya', 'a', 'LP');
+-- expectNomatch	11.12 LP	{\ya}		ba
+select * from test_regex('\ya', 'ba', 'LP');
+-- expectMatch	11.13 LP	{a\y}		a	a
+select * from test_regex('a\y', 'a', 'LP');
+-- expectNomatch	11.14 LP	{a\y}		ab
+select * from test_regex('a\y', 'ab', 'LP');
+-- expectMatch	11.15 LP	{a\Y}		ab	a
+select * from test_regex('a\Y', 'ab', 'LP');
+-- expectNomatch	11.16 LP	{a\Y}		a-
+select * from test_regex('a\Y', 'a-', 'LP');
+-- expectNomatch	11.17 LP	{a\Y}		a
+select * from test_regex('a\Y', 'a', 'LP');
+-- expectNomatch	11.18 LP	{-\Y}		-a
+select * from test_regex('-\Y', '-a', 'LP');
+-- expectMatch	11.19 LP	{-\Y}		-%	-
+select * from test_regex('-\Y', '-%', 'LP');
+-- expectNomatch	11.20 LP	{\Y-}		a-
+select * from test_regex('\Y-', 'a-', 'LP');
+-- expectError	11.21 -		{[[:<:]]*}	BADRPT
+select * from test_regex('[[:<:]]*', '', '-');
+-- expectError	11.22 -		{[[:>:]]*}	BADRPT
+select * from test_regex('[[:>:]]*', '', '-');
+-- expectError	11.23 b		{\<*}		BADRPT
+select * from test_regex('\<*', '', 'b');
+-- expectError	11.24 b		{\>*}		BADRPT
+select * from test_regex('\>*', '', 'b');
+-- expectError	11.25 -		{\y*}		BADRPT
+select * from test_regex('\y*', '', '-');
+-- expectError	11.26 -		{\Y*}		BADRPT
+select * from test_regex('\Y*', '', '-');
+-- expectMatch	11.27 LP	{\ma}		a	a
+select * from test_regex('\ma', 'a', 'LP');
+-- expectNomatch	11.28 LP	{\ma}		ba
+select * from test_regex('\ma', 'ba', 'LP');
+-- expectMatch	11.29 LP	{a\M}		a	a
+select * from test_regex('a\M', 'a', 'LP');
+-- expectNomatch	11.30 LP	{a\M}		ab
+select * from test_regex('a\M', 'ab', 'LP');
+-- expectNomatch	11.31 ILP	{\Ma}		a
+select * from test_regex('\Ma', 'a', 'ILP');
+-- expectNomatch	11.32 ILP	{a\m}		a
+select * from test_regex('a\m', 'a', 'ILP');
+
+-- doing 12 "character classes"
+
+-- expectMatch	12.1  LP	{a\db}		a0b	a0b
+select * from test_regex('a\db', 'a0b', 'LP');
+-- expectNomatch	12.2  LP	{a\db}		axb
+select * from test_regex('a\db', 'axb', 'LP');
+-- expectNomatch	12.3  LP	{a\Db}		a0b
+select * from test_regex('a\Db', 'a0b', 'LP');
+-- expectMatch	12.4  LP	{a\Db}		axb	axb
+select * from test_regex('a\Db', 'axb', 'LP');
+-- expectMatch	12.5  LP	"a\\sb"		"a b"	"a b"
+select * from test_regex('a\sb', 'a b', 'LP');
+-- expectMatch	12.6  LP	"a\\sb"		"a\tb"	"a\tb"
+select * from test_regex('a\sb', E'a\tb', 'LP');
+-- expectMatch	12.7  LP	"a\\sb"		"a\nb"	"a\nb"
+select * from test_regex('a\sb', E'a\nb', 'LP');
+-- expectNomatch	12.8  LP	{a\sb}		axb
+select * from test_regex('a\sb', 'axb', 'LP');
+-- expectMatch	12.9  LP	{a\Sb}		axb	axb
+select * from test_regex('a\Sb', 'axb', 'LP');
+-- expectNomatch	12.10 LP	"a\\Sb"		"a b"
+select * from test_regex('a\Sb', 'a b', 'LP');
+-- expectMatch	12.11 LP	{a\wb}		axb	axb
+select * from test_regex('a\wb', 'axb', 'LP');
+-- expectNomatch	12.12 LP	{a\wb}		a-b
+select * from test_regex('a\wb', 'a-b', 'LP');
+-- expectNomatch	12.13 LP	{a\Wb}		axb
+select * from test_regex('a\Wb', 'axb', 'LP');
+-- expectMatch	12.14 LP	{a\Wb}		a-b	a-b
+select * from test_regex('a\Wb', 'a-b', 'LP');
+-- expectMatch	12.15 LP	{\y\w+z\y}	adze-guz	guz
+select * from test_regex('\y\w+z\y', 'adze-guz', 'LP');
+-- expectMatch	12.16 LPE	{a[\d]b}	a1b	a1b
+select * from test_regex('a[\d]b', 'a1b', 'LPE');
+-- expectMatch	12.17 LPE	"a\[\\s]b"	"a b"	"a b"
+select * from test_regex('a[\s]b', 'a b', 'LPE');
+-- expectMatch	12.18 LPE	{a[\w]b}	axb	axb
+select * from test_regex('a[\w]b', 'axb', 'LPE');
+
+-- doing 13 "escapes"
+
+-- expectError	13.1  &		"a\\"		EESCAPE
+select * from test_regex('a\', '', '');
+select * from test_regex('a\', '', 'b');
+-- expectMatch	13.2  -		{a\<b}		a<b	a<b
+select * from test_regex('a\<b', 'a<b', '-');
+-- expectMatch	13.3  e		{a\<b}		a<b	a<b
+select * from test_regex('a\<b', 'a<b', 'e');
+-- expectMatch	13.4  bAS	{a\wb}		awb	awb
+select * from test_regex('a\wb', 'awb', 'bAS');
+-- expectMatch	13.5  eAS	{a\wb}		awb	awb
+select * from test_regex('a\wb', 'awb', 'eAS');
+-- expectMatch	13.6  PL	"a\\ab"		"a\007b"	"a\007b"
+select * from test_regex('a\ab', E'a\007b', 'PL');
+-- expectMatch	13.7  P		"a\\bb"		"a\bb"	"a\bb"
+select * from test_regex('a\bb', E'a\bb', 'P');
+-- expectMatch	13.8  P		{a\Bb}		"a\\b"	"a\\b"
+select * from test_regex('a\Bb', 'a\b', 'P');
+-- expectMatch	13.9  MP	"a\\chb"	"a\bb"	"a\bb"
+select * from test_regex('a\chb', E'a\bb', 'MP');
+-- expectMatch	13.10 MP	"a\\cHb"	"a\bb"	"a\bb"
+select * from test_regex('a\cHb', E'a\bb', 'MP');
+-- expectMatch	13.11 LMP	"a\\e"		"a\033"	"a\033"
+select * from test_regex('a\e', E'a\033', 'LMP');
+-- expectMatch	13.12 P		"a\\fb"		"a\fb"	"a\fb"
+select * from test_regex('a\fb', E'a\fb', 'P');
+-- expectMatch	13.13 P		"a\\nb"		"a\nb"	"a\nb"
+select * from test_regex('a\nb', E'a\nb', 'P');
+-- expectMatch	13.14 P		"a\\rb"		"a\rb"	"a\rb"
+select * from test_regex('a\rb', E'a\rb', 'P');
+-- expectMatch	13.15 P		"a\\tb"		"a\tb"	"a\tb"
+select * from test_regex('a\tb', E'a\tb', 'P');
+-- expectMatch	13.16 P		"a\\u0008x"	"a\bx"	"a\bx"
+select * from test_regex('a\u0008x', E'a\bx', 'P');
+-- expectMatch	13.17 P		{a\u008x}	"a\bx"	"a\bx"
+-- Tcl has relaxed their code to allow 1-4 hex digits, but Postgres hasn't
+select * from test_regex('a\u008x', E'a\bx', 'P');
+-- expectMatch	13.18 P		"a\\u00088x"	"a\b8x"	"a\b8x"
+select * from test_regex('a\u00088x', E'a\b8x', 'P');
+-- expectMatch	13.19 P		"a\\U00000008x"	"a\bx"	"a\bx"
+select * from test_regex('a\U00000008x', E'a\bx', 'P');
+-- expectMatch	13.20 P		{a\U0000008x}	"a\bx"	"a\bx"
+-- Tcl has relaxed their code to allow 1-8 hex digits, but Postgres hasn't
+select * from test_regex('a\U0000008x', E'a\bx', 'P');
+-- expectMatch	13.21 P		"a\\vb"		"a\vb"	"a\vb"
+select * from test_regex('a\vb', E'a\013b', 'P');
+-- expectMatch	13.22 MP	"a\\x08x"	"a\bx"	"a\bx"
+select * from test_regex('a\x08x', E'a\bx', 'MP');
+-- expectError	13.23 -		{a\xq}		EESCAPE
+select * from test_regex('a\xq', '', '-');
+-- expectMatch	13.24 MP	"a\\x08x"	"a\bx"	"a\bx"
+select * from test_regex('a\x08x', E'a\bx', 'MP');
+-- expectError	13.25 -		{a\z}		EESCAPE
+select * from test_regex('a\z', '', '-');
+-- expectMatch	13.26 MP	"a\\010b"	"a\bb"	"a\bb"
+select * from test_regex('a\010b', E'a\bb', 'MP');
+-- These only work in UTF8 encoding, so they're moved to test_regex_utf8.sql:
+-- expectMatch	13.27 P		"a\\U00001234x"	"a\u1234x"	"a\u1234x"
+-- expectMatch	13.28 P		{a\U00001234x}	"a\u1234x"	"a\u1234x"
+-- expectMatch	13.29 P		"a\\U0001234x"	"a\u1234x"	"a\u1234x"
+-- expectMatch	13.30 P		{a\U0001234x}	"a\u1234x"	"a\u1234x"
+-- expectMatch	13.31 P		"a\\U000012345x"	"a\u12345x"	"a\u12345x"
+-- expectMatch	13.32 P		{a\U000012345x}	"a\u12345x"	"a\u12345x"
+-- expectMatch	13.33 P		"a\\U1000000x"	"a\ufffd0x"	"a\ufffd0x"
+-- expectMatch	13.34 P		{a\U1000000x}	"a\ufffd0x"	"a\ufffd0x"
+
+-- doing 14 "back references"
+-- # ugh
+
+-- expectMatch	14.1  RP	{a(b*)c\1}	abbcbb	abbcbb	bb
+select * from test_regex('a(b*)c\1', 'abbcbb', 'RP');
+-- expectMatch	14.2  RP	{a(b*)c\1}	ac	ac	""
+select * from test_regex('a(b*)c\1', 'ac', 'RP');
+-- expectNomatch	14.3  RP	{a(b*)c\1}	abbcb
+select * from test_regex('a(b*)c\1', 'abbcb', 'RP');
+-- expectMatch	14.4  RP	{a(b*)\1}	abbcbb	abb	b
+select * from test_regex('a(b*)\1', 'abbcbb', 'RP');
+-- expectMatch	14.5  RP	{a(b|bb)\1}	abbcbb	abb	b
+select * from test_regex('a(b|bb)\1', 'abbcbb', 'RP');
+-- expectMatch	14.6  RP	{a([bc])\1}	abb	abb	b
+select * from test_regex('a([bc])\1', 'abb', 'RP');
+-- expectNomatch	14.7  RP	{a([bc])\1}	abc
+select * from test_regex('a([bc])\1', 'abc', 'RP');
+-- expectMatch	14.8  RP	{a([bc])\1}	abcabb	abb	b
+select * from test_regex('a([bc])\1', 'abcabb', 'RP');
+-- expectNomatch	14.9  RP	{a([bc])*\1}	abc
+select * from test_regex('a([bc])*\1', 'abc', 'RP');
+-- expectNomatch	14.10 RP	{a([bc])\1}	abB
+select * from test_regex('a([bc])\1', 'abB', 'RP');
+-- expectMatch	14.11 iRP	{a([bc])\1}	abB	abB	b
+select * from test_regex('a([bc])\1', 'abB', 'iRP');
+-- expectMatch	14.12 RP	{a([bc])\1+}	abbb	abbb	b
+select * from test_regex('a([bc])\1+', 'abbb', 'RP');
+-- expectMatch	14.13 QRP	"a(\[bc])\\1{3,4}"	abbbb	abbbb	b
+select * from test_regex('a([bc])\1{3,4}', 'abbbb', 'QRP');
+-- expectNomatch	14.14 QRP	"a(\[bc])\\1{3,4}"	abbb
+select * from test_regex('a([bc])\1{3,4}', 'abbb', 'QRP');
+-- expectMatch	14.15 RP	{a([bc])\1*}	abbb	abbb	b
+select * from test_regex('a([bc])\1*', 'abbb', 'RP');
+-- expectMatch	14.16 RP	{a([bc])\1*}	ab	ab	b
+select * from test_regex('a([bc])\1*', 'ab', 'RP');
+-- expectMatch	14.17 RP	{a([bc])(\1*)}	ab	ab	b	""
+select * from test_regex('a([bc])(\1*)', 'ab', 'RP');
+-- expectError	14.18 -		{a((b)\1)}	ESUBREG
+select * from test_regex('a((b)\1)', '', '-');
+-- expectError	14.19 -		{a(b)c\2}	ESUBREG
+select * from test_regex('a(b)c\2', '', '-');
+-- expectMatch	14.20 bR	{a\(b*\)c\1}	abbcbb	abbcbb	bb
+select * from test_regex('a\(b*\)c\1', 'abbcbb', 'bR');
+-- expectMatch	14.21 RP	{^([bc])\1*$}	bbb	bbb	b
+select * from test_regex('^([bc])\1*$', 'bbb', 'RP');
+-- expectMatch	14.22 RP	{^([bc])\1*$}	ccc	ccc	c
+select * from test_regex('^([bc])\1*$', 'ccc', 'RP');
+-- expectNomatch	14.23 RP	{^([bc])\1*$}	bcb
+select * from test_regex('^([bc])\1*$', 'bcb', 'RP');
+-- expectMatch	14.24 LRP	{^(\w+)( \1)+$}	{abc abc abc} {abc abc abc} abc { abc}
+select * from test_regex('^(\w+)( \1)+$', 'abc abc abc', 'LRP');
+-- expectNomatch	14.25 LRP	{^(\w+)( \1)+$}	{abc abd abc}
+select * from test_regex('^(\w+)( \1)+$', 'abc abd abc', 'LRP');
+-- expectNomatch	14.26 LRP	{^(\w+)( \1)+$}	{abc abc abd}
+select * from test_regex('^(\w+)( \1)+$', 'abc abc abd', 'LRP');
+-- expectMatch	14.27 RP	{^(.+)( \1)+$}	{abc abc abc} {abc abc abc} abc { abc}
+select * from test_regex('^(.+)( \1)+$', 'abc abc abc', 'RP');
+-- expectNomatch	14.28 RP	{^(.+)( \1)+$}	{abc abd abc}
+select * from test_regex('^(.+)( \1)+$', 'abc abd abc', 'RP');
+-- expectNomatch	14.29 RP	{^(.+)( \1)+$}	{abc abc abd}
+select * from test_regex('^(.+)( \1)+$', 'abc abc abd', 'RP');
+
+-- doing 15 "octal escapes vs back references"
+
+-- # initial zero is always octal
+-- expectMatch	15.1  MP	"a\\010b"	"a\bb"	"a\bb"
+select * from test_regex('a\010b', E'a\bb', 'MP');
+-- expectMatch	15.2  MP	"a\\0070b"	"a\0070b"	"a\0070b"
+select * from test_regex('a\0070b', E'a\0070b', 'MP');
+-- expectMatch	15.3  MP	"a\\07b"	"a\007b"	"a\007b"
+select * from test_regex('a\07b', E'a\007b', 'MP');
+-- expectMatch	15.4  MP	"a(b)(b)(b)(b)(b)(b)(b)(b)(b)(b)\\07c" \
+-- 	"abbbbbbbbbb\007c" abbbbbbbbbb\007c b b b b b b b b b b
+select * from test_regex('a(b)(b)(b)(b)(b)(b)(b)(b)(b)(b)\07c', E'abbbbbbbbbb\007c', 'MP');
+-- # a single digit is always a backref
+-- expectError	15.5  -		{a\7b}	ESUBREG
+select * from test_regex('a\7b', '', '-');
+-- # otherwise it's a backref only if within range (barf!)
+-- expectMatch	15.6  MP	"a\\10b"	"a\bb"	"a\bb"
+select * from test_regex('a\10b', E'a\bb', 'MP');
+-- expectMatch	15.7  MP	{a\101b}	aAb	aAb
+select * from test_regex('a\101b', 'aAb', 'MP');
+-- expectMatch	15.8  RP	{a(b)(b)(b)(b)(b)(b)(b)(b)(b)(b)\10c} \
+-- 	"abbbbbbbbbbbc" abbbbbbbbbbbc b b b b b b b b b b
+select * from test_regex('a(b)(b)(b)(b)(b)(b)(b)(b)(b)(b)\10c', 'abbbbbbbbbbbc', 'RP');
+-- # but we're fussy about border cases -- guys who want octal should use the zero
+-- expectError	15.9  -	{a((((((((((b\10))))))))))c}	ESUBREG
+select * from test_regex('a((((((((((b\10))))))))))c', '', '-');
+-- # BREs don't have octal, EREs don't have backrefs
+-- expectMatch	15.10 MP	"a\\12b"	"a\nb"	"a\nb"
+select * from test_regex('a\12b', E'a\nb', 'MP');
+-- expectError	15.11 b		{a\12b}		ESUBREG
+select * from test_regex('a\12b', '', 'b');
+-- expectMatch	15.12 eAS	{a\12b}		a12b	a12b
+select * from test_regex('a\12b', 'a12b', 'eAS');
+-- expectMatch	15.13 MP	{a\701b}	a\u00381b	a\u00381b
+select * from test_regex('a\701b', 'a81b', 'MP');
+
+-- doing 16 "expanded syntax"
+
+-- expectMatch	16.1 xP		"a b c"		"abc"	"abc"
+select * from test_regex('a b c', 'abc', 'xP');
+-- expectMatch	16.2 xP		"a b #oops\nc\td"	"abcd"	"abcd"
+select * from test_regex(E'a b #oops\nc\td', 'abcd', 'xP');
+-- expectMatch	16.3 x		"a\\ b\\\tc"	"a b\tc"	"a b\tc"
+select * from test_regex(E'a\\ b\\\tc', E'a b\tc', 'x');
+-- expectMatch	16.4 xP		"a b\\#c"	"ab#c"	"ab#c"
+select * from test_regex('a b\#c', 'ab#c', 'xP');
+-- expectMatch	16.5 xP		"a b\[c d]e"	"ab e"	"ab e"
+select * from test_regex('a b[c d]e', 'ab e', 'xP');
+-- expectMatch	16.6 xP		"a b\[c#d]e"	"ab#e"	"ab#e"
+select * from test_regex('a b[c#d]e', 'ab#e', 'xP');
+-- expectMatch	16.7 xP		"a b\[c#d]e"	"abde"	"abde"
+select * from test_regex('a b[c#d]e', 'abde', 'xP');
+-- expectMatch	16.8 xSPB	"ab{ d"		"ab\{d"	"ab\{d"
+select * from test_regex('ab{ d', 'ab{d', 'xSPB');
+-- expectMatch	16.9 xPQ	"ab{ 1 , 2 }c"	"abc"	"abc"
+select * from test_regex('ab{ 1 , 2 }c', 'abc', 'xPQ');
+
+-- doing 17 "misc syntax"
+
+-- expectMatch	17.1 P	a(?#comment)b	ab	ab
+select * from test_regex('a(?#comment)b', 'ab', 'P');
+
+-- doing 18 "unmatchable REs"
+
+-- expectNomatch	18.1 I	a^b		ab
+select * from test_regex('a^b', 'ab', 'I');
+
+-- doing 19 "case independence"
+
+-- expectMatch	19.1 &i		ab		Ab	Ab
+select * from test_regex('ab', 'Ab', 'i');
+select * from test_regex('ab', 'Ab', 'ib');
+-- expectMatch	19.2 &i		{a[bc]}		aC	aC
+select * from test_regex('a[bc]', 'aC', 'i');
+select * from test_regex('a[bc]', 'aC', 'ib');
+-- expectNomatch	19.3 &i		{a[^bc]}	aB
+select * from test_regex('a[^bc]', 'aB', 'i');
+select * from test_regex('a[^bc]', 'aB', 'ib');
+-- expectMatch	19.4 &iM	{a[b-d]}	aC	aC
+select * from test_regex('a[b-d]', 'aC', 'iM');
+select * from test_regex('a[b-d]', 'aC', 'iMb');
+-- expectNomatch	19.5 &iM	{a[^b-d]}	aC
+select * from test_regex('a[^b-d]', 'aC', 'iM');
+select * from test_regex('a[^b-d]', 'aC', 'iMb');
+
+-- doing 20 "directors and embedded options"
+
+-- expectError	20.1  &		***?		BADPAT
+select * from test_regex('***?', '', '');
+select * from test_regex('***?', '', 'b');
+-- expectMatch	20.2  q		***?		***?	***?
+select * from test_regex('***?', '***?', 'q');
+-- expectMatch	20.3  &P	***=a*b		a*b	a*b
+select * from test_regex('***=a*b', 'a*b', 'P');
+select * from test_regex('***=a*b', 'a*b', 'Pb');
+-- expectMatch	20.4  q		***=a*b		***=a*b	***=a*b
+select * from test_regex('***=a*b', '***=a*b', 'q');
+-- expectMatch	20.5  bLP	{***:\w+}	ab	ab
+select * from test_regex('***:\w+', 'ab', 'bLP');
+-- expectMatch	20.6  eLP	{***:\w+}	ab	ab
+select * from test_regex('***:\w+', 'ab', 'eLP');
+-- expectError	20.7  &		***:***=a*b	BADRPT
+select * from test_regex('***:***=a*b', '', '');
+select * from test_regex('***:***=a*b', '', 'b');
+-- expectMatch	20.8  &P	***:(?b)a+b	a+b	a+b
+select * from test_regex('***:(?b)a+b', 'a+b', 'P');
+select * from test_regex('***:(?b)a+b', 'a+b', 'Pb');
+-- expectMatch	20.9  P		(?b)a+b		a+b	a+b
+select * from test_regex('(?b)a+b', 'a+b', 'P');
+-- expectError	20.10 e		{(?b)\w+}	BADRPT
+select * from test_regex('(?b)\w+', '', 'e');
+-- expectMatch	20.11 bAS	{(?b)\w+}	(?b)w+	(?b)w+
+select * from test_regex('(?b)\w+', '(?b)w+', 'bAS');
+-- expectMatch	20.12 iP	(?c)a		a	a
+select * from test_regex('(?c)a', 'a', 'iP');
+-- expectNomatch	20.13 iP	(?c)a		A
+select * from test_regex('(?c)a', 'A', 'iP');
+-- expectMatch	20.14 APS	{(?e)\W+}	WW	WW
+select * from test_regex('(?e)\W+', 'WW', 'APS');
+-- expectMatch	20.15 P		(?i)a+		Aa	Aa
+select * from test_regex('(?i)a+', 'Aa', 'P');
+-- expectNomatch	20.16 P		"(?m)a.b"	"a\nb"
+select * from test_regex('(?m)a.b', E'a\nb', 'P');
+-- expectMatch	20.17 P		"(?m)^b"	"a\nb"	"b"
+select * from test_regex('(?m)^b', E'a\nb', 'P');
+-- expectNomatch	20.18 P		"(?n)a.b"	"a\nb"
+select * from test_regex('(?n)a.b', E'a\nb', 'P');
+-- expectMatch	20.19 P		"(?n)^b"	"a\nb"	"b"
+select * from test_regex('(?n)^b', E'a\nb', 'P');
+-- expectNomatch	20.20 P		"(?p)a.b"	"a\nb"
+select * from test_regex('(?p)a.b', E'a\nb', 'P');
+-- expectNomatch	20.21 P		"(?p)^b"	"a\nb"
+select * from test_regex('(?p)^b', E'a\nb', 'P');
+-- expectMatch	20.22 P		(?q)a+b		a+b	a+b
+select * from test_regex('(?q)a+b', 'a+b', 'P');
+-- expectMatch	20.23 nP	"(?s)a.b"	"a\nb"	"a\nb"
+select * from test_regex('(?s)a.b', E'a\nb', 'nP');
+-- expectMatch	20.24 xP	"(?t)a b"	"a b"	"a b"
+select * from test_regex('(?t)a b', 'a b', 'xP');
+-- expectMatch	20.25 P		"(?w)a.b"	"a\nb"	"a\nb"
+select * from test_regex('(?w)a.b', E'a\nb', 'P');
+-- expectMatch	20.26 P		"(?w)^b"	"a\nb"	"b"
+select * from test_regex('(?w)^b', E'a\nb', 'P');
+-- expectMatch	20.27 P		"(?x)a b"	"ab"	"ab"
+select * from test_regex('(?x)a b', 'ab', 'P');
+-- expectError	20.28 -		(?z)ab		BADOPT
+select * from test_regex('(?z)ab', '', '-');
+-- expectMatch	20.29 P		(?ici)a+	Aa	Aa
+select * from test_regex('(?ici)a+', 'Aa', 'P');
+-- expectError	20.30 P		(?i)(?q)a+	BADRPT
+select * from test_regex('(?i)(?q)a+', '', 'P');
+-- expectMatch	20.31 P		(?q)(?i)a+	(?i)a+	(?i)a+
+select * from test_regex('(?q)(?i)a+', '(?i)a+', 'P');
+-- expectMatch	20.32 P		(?qe)a+		a	a
+select * from test_regex('(?qe)a+', 'a', 'P');
+-- expectMatch	20.33 xP	"(?q)a b"	"a b"	"a b"
+select * from test_regex('(?q)a b', 'a b', 'xP');
+-- expectMatch	20.34 P		"(?qx)a b"	"a b"	"a b"
+select * from test_regex('(?qx)a b', 'a b', 'P');
+-- expectMatch	20.35 P		(?qi)ab		Ab	Ab
+select * from test_regex('(?qi)ab', 'Ab', 'P');
+
+-- doing 21 "capturing"
+
+-- expectMatch	21.1  -		a(b)c		abc	abc	b
+select * from test_regex('a(b)c', 'abc', '-');
+-- expectMatch	21.2  P		a(?:b)c		xabc	abc
+select * from test_regex('a(?:b)c', 'xabc', 'P');
+-- expectMatch	21.3  -		a((b))c		xabcy	abc	b	b
+select * from test_regex('a((b))c', 'xabcy', '-');
+-- expectMatch	21.4  P		a(?:(b))c	abcy	abc	b
+select * from test_regex('a(?:(b))c', 'abcy', 'P');
+-- expectMatch	21.5  P		a((?:b))c	abc	abc	b
+select * from test_regex('a((?:b))c', 'abc', 'P');
+-- expectMatch	21.6  P		a(?:(?:b))c	abc	abc
+select * from test_regex('a(?:(?:b))c', 'abc', 'P');
+-- expectIndices	21.7  Q		"a(b){0}c"	ac	{0 1}	{-1 -1}
+select * from test_regex('a(b){0}c', 'ac', '0Q');
+-- expectMatch	21.8  -		a(b)c(d)e	abcde	abcde	b	d
+select * from test_regex('a(b)c(d)e', 'abcde', '-');
+-- expectMatch	21.9  -		(b)c(d)e	bcde	bcde	b	d
+select * from test_regex('(b)c(d)e', 'bcde', '-');
+-- expectMatch	21.10 -		a(b)(d)e	abde	abde	b	d
+select * from test_regex('a(b)(d)e', 'abde', '-');
+-- expectMatch	21.11 -		a(b)c(d)	abcd	abcd	b	d
+select * from test_regex('a(b)c(d)', 'abcd', '-');
+-- expectMatch	21.12 -		(ab)(cd)	xabcdy	abcd	ab	cd
+select * from test_regex('(ab)(cd)', 'xabcdy', '-');
+-- expectMatch	21.13 -		a(b)?c		xabcy	abc	b
+select * from test_regex('a(b)?c', 'xabcy', '-');
+-- expectIndices	21.14 -		a(b)?c		xacy	{1 2}	{-1 -1}
+select * from test_regex('a(b)?c', 'xacy', '0-');
+-- expectMatch	21.15 -		a(b)?c(d)?e	xabcdey	abcde	b	d
+select * from test_regex('a(b)?c(d)?e', 'xabcdey', '-');
+-- expectIndices	21.16 -		a(b)?c(d)?e	xacdey	{1 4}	{-1 -1}	{3 3}
+select * from test_regex('a(b)?c(d)?e', 'xacdey', '0-');
+-- expectIndices	21.17 -		a(b)?c(d)?e	xabcey	{1 4}	{2 2}	{-1 -1}
+select * from test_regex('a(b)?c(d)?e', 'xabcey', '0-');
+-- expectIndices	21.18 -		a(b)?c(d)?e	xacey	{1 3}	{-1 -1}	{-1 -1}
+select * from test_regex('a(b)?c(d)?e', 'xacey', '0-');
+-- expectMatch	21.19 -		a(b)*c		xabcy	abc	b
+select * from test_regex('a(b)*c', 'xabcy', '-');
+-- expectIndices	21.20 -		a(b)*c		xabbbcy	{1 5}	{4 4}
+select * from test_regex('a(b)*c', 'xabbbcy', '0-');
+-- expectIndices	21.21 -		a(b)*c		xacy	{1 2}	{-1 -1}
+select * from test_regex('a(b)*c', 'xacy', '0-');
+-- expectMatch	21.22 -		a(b*)c		xabbbcy	abbbc	bbb
+select * from test_regex('a(b*)c', 'xabbbcy', '-');
+-- expectMatch	21.23 -		a(b*)c		xacy	ac	""
+select * from test_regex('a(b*)c', 'xacy', '-');
+-- expectNomatch	21.24 -		a(b)+c		xacy
+select * from test_regex('a(b)+c', 'xacy', '-');
+-- expectMatch	21.25 -		a(b)+c		xabcy	abc	b
+select * from test_regex('a(b)+c', 'xabcy', '-');
+-- expectIndices	21.26 -		a(b)+c		xabbbcy	{1 5}	{4 4}
+select * from test_regex('a(b)+c', 'xabbbcy', '0-');
+-- expectMatch	21.27 -		a(b+)c		xabbbcy	abbbc	bbb
+select * from test_regex('a(b+)c', 'xabbbcy', '-');
+-- expectIndices	21.28 Q		"a(b){2,3}c"	xabbbcy	{1 5}	{4 4}
+select * from test_regex('a(b){2,3}c', 'xabbbcy', '0Q');
+-- expectIndices	21.29 Q		"a(b){2,3}c"	xabbcy	{1 4}	{3 3}
+select * from test_regex('a(b){2,3}c', 'xabbcy', '0Q');
+-- expectNomatch	21.30 Q		"a(b){2,3}c"	xabcy
+select * from test_regex('a(b){2,3}c', 'xabcy', 'Q');
+-- expectMatch	21.31 LP	"\\y(\\w+)\\y"	"-- abc-"	"abc"	"abc"
+select * from test_regex('\y(\w+)\y', '-- abc-', 'LP');
+-- expectMatch	21.32 -		a((b|c)d+)+	abacdbd	acdbd	bd	b
+select * from test_regex('a((b|c)d+)+', 'abacdbd', '-');
+-- expectMatch	21.33 N		(.*).*		abc	abc	abc
+select * from test_regex('(.*).*', 'abc', 'N');
+-- expectMatch	21.34 N		(a*)*		bc	""	""
+select * from test_regex('(a*)*', 'bc', 'N');
+-- expectMatch	21.35 M		{ TO (([a-z0-9._]+|"([^"]+|"")+")+)}	{asd TO foo}	{ TO foo} foo o {}
+select * from test_regex(' TO (([a-z0-9._]+|"([^"]+|"")+")+)', 'asd TO foo', 'M');
+
+-- doing 22 "multicharacter collating elements"
+-- # again ugh
+
+-- MCCEs are not implemented in Postgres, so we skip all these tests
+-- expectMatch	22.1  &+L	{a[c]e}		ace	ace
+-- select * from test_regex('a[c]e', 'ace', '+L');
+-- select * from test_regex('a[c]e', 'ace', '+Lb');
+-- expectNomatch	22.2  &+IL	{a[c]h}		ach
+-- select * from test_regex('a[c]h', 'ach', '+IL');
+-- select * from test_regex('a[c]h', 'ach', '+ILb');
+-- expectMatch	22.3  &+L	{a[[.ch.]]}	ach	ach
+-- select * from test_regex('a[[.ch.]]', 'ach', '+L');
+-- select * from test_regex('a[[.ch.]]', 'ach', '+Lb');
+-- expectNomatch	22.4  &+L	{a[[.ch.]]}	ace
+-- select * from test_regex('a[[.ch.]]', 'ace', '+L');
+-- select * from test_regex('a[[.ch.]]', 'ace', '+Lb');
+-- expectMatch	22.5  &+L	{a[c[.ch.]]}	ac	ac
+-- select * from test_regex('a[c[.ch.]]', 'ac', '+L');
+-- select * from test_regex('a[c[.ch.]]', 'ac', '+Lb');
+-- expectMatch	22.6  &+L	{a[c[.ch.]]}	ace	ac
+-- select * from test_regex('a[c[.ch.]]', 'ace', '+L');
+-- select * from test_regex('a[c[.ch.]]', 'ace', '+Lb');
+-- expectMatch	22.7  &+L	{a[c[.ch.]]}	ache	ach
+-- select * from test_regex('a[c[.ch.]]', 'ache', '+L');
+-- select * from test_regex('a[c[.ch.]]', 'ache', '+Lb');
+-- expectNomatch	22.8  &+L	{a[^c]e}	ace
+-- select * from test_regex('a[^c]e', 'ace', '+L');
+-- select * from test_regex('a[^c]e', 'ace', '+Lb');
+-- expectMatch	22.9  &+L	{a[^c]e}	abe	abe
+-- select * from test_regex('a[^c]e', 'abe', '+L');
+-- select * from test_regex('a[^c]e', 'abe', '+Lb');
+-- expectMatch	22.10 &+L	{a[^c]e}	ache	ache
+-- select * from test_regex('a[^c]e', 'ache', '+L');
+-- select * from test_regex('a[^c]e', 'ache', '+Lb');
+-- expectNomatch	22.11 &+L	{a[^[.ch.]]}	ach
+-- select * from test_regex('a[^[.ch.]]', 'ach', '+L');
+-- select * from test_regex('a[^[.ch.]]', 'ach', '+Lb');
+-- expectMatch	22.12 &+L	{a[^[.ch.]]}	ace	ac
+-- select * from test_regex('a[^[.ch.]]', 'ace', '+L');
+-- select * from test_regex('a[^[.ch.]]', 'ace', '+Lb');
+-- expectMatch	22.13 &+L	{a[^[.ch.]]}	ac	ac
+-- select * from test_regex('a[^[.ch.]]', 'ac', '+L');
+-- select * from test_regex('a[^[.ch.]]', 'ac', '+Lb');
+-- expectMatch	22.14 &+L	{a[^[.ch.]]}	abe	ab
+-- select * from test_regex('a[^[.ch.]]', 'abe', '+L');
+-- select * from test_regex('a[^[.ch.]]', 'abe', '+Lb');
+-- expectNomatch	22.15 &+L	{a[^c[.ch.]]}	ach
+-- select * from test_regex('a[^c[.ch.]]', 'ach', '+L');
+-- select * from test_regex('a[^c[.ch.]]', 'ach', '+Lb');
+-- expectNomatch	22.16 &+L	{a[^c[.ch.]]}	ace
+-- select * from test_regex('a[^c[.ch.]]', 'ace', '+L');
+-- select * from test_regex('a[^c[.ch.]]', 'ace', '+Lb');
+-- expectNomatch	22.17 &+L	{a[^c[.ch.]]}	ac
+-- select * from test_regex('a[^c[.ch.]]', 'ac', '+L');
+-- select * from test_regex('a[^c[.ch.]]', 'ac', '+Lb');
+-- expectMatch	22.18 &+L	{a[^c[.ch.]]}	abe	ab
+-- select * from test_regex('a[^c[.ch.]]', 'abe', '+L');
+-- select * from test_regex('a[^c[.ch.]]', 'abe', '+Lb');
+-- expectMatch	22.19 &+L	{a[^b]}		ac	ac
+-- select * from test_regex('a[^b]', 'ac', '+L');
+-- select * from test_regex('a[^b]', 'ac', '+Lb');
+-- expectMatch	22.20 &+L	{a[^b]}		ace	ac
+-- select * from test_regex('a[^b]', 'ace', '+L');
+-- select * from test_regex('a[^b]', 'ace', '+Lb');
+-- expectMatch	22.21 &+L	{a[^b]}		ach	ach
+-- select * from test_regex('a[^b]', 'ach', '+L');
+-- select * from test_regex('a[^b]', 'ach', '+Lb');
+-- expectNomatch	22.22 &+L	{a[^b]}		abe
+-- select * from test_regex('a[^b]', 'abe', '+L');
+-- select * from test_regex('a[^b]', 'abe', '+Lb');
+
+-- doing 23 "lookahead constraints"
+
+-- expectMatch	23.1 HP		a(?=b)b*	ab	ab
+select * from test_regex('a(?=b)b*', 'ab', 'HP');
+-- expectNomatch	23.2 HP		a(?=b)b*	a
+select * from test_regex('a(?=b)b*', 'a', 'HP');
+-- expectMatch	23.3 HP		a(?=b)b*(?=c)c*	abc	abc
+select * from test_regex('a(?=b)b*(?=c)c*', 'abc', 'HP');
+-- expectNomatch	23.4 HP		a(?=b)b*(?=c)c*	ab
+select * from test_regex('a(?=b)b*(?=c)c*', 'ab', 'HP');
+-- expectNomatch	23.5 HP		a(?!b)b*	ab
+select * from test_regex('a(?!b)b*', 'ab', 'HP');
+-- expectMatch	23.6 HP		a(?!b)b*	a	a
+select * from test_regex('a(?!b)b*', 'a', 'HP');
+-- expectMatch	23.7 HP		(?=b)b		b	b
+select * from test_regex('(?=b)b', 'b', 'HP');
+-- expectNomatch	23.8 HP		(?=b)b		a
+select * from test_regex('(?=b)b', 'a', 'HP');
+
+-- Postgres addition: lookbehind constraints
+
+-- expectMatch	23.11 HPN		(?<=a)b*	ab	b
+select * from test_regex('(?<=a)b*', 'ab', 'HPN');
+-- expectNomatch	23.12 HPN		(?<=a)b*	b
+select * from test_regex('(?<=a)b*', 'b', 'HPN');
+-- expectMatch	23.13 HP		(?<=a)b*(?<=b)c*	abc	bc
+select * from test_regex('(?<=a)b*(?<=b)c*', 'abc', 'HP');
+-- expectNomatch	23.14 HP		(?<=a)b*(?<=b)c*	ac
+select * from test_regex('(?<=a)b*(?<=b)c*', 'ac', 'HP');
+-- expectNomatch	23.15 IHP		a(?<!a)b*	ab
+select * from test_regex('a(?<!a)b*', 'ab', 'IHP');
+-- expectMatch	23.16 HP		a(?<!b)b*	a	a
+select * from test_regex('a(?<!b)b*', 'a', 'HP');
+-- expectMatch	23.17 HP		(?<=b)b		bb	b
+select * from test_regex('(?<=b)b', 'bb', 'HP');
+-- expectNomatch	23.18 HP		(?<=b)b		b
+select * from test_regex('(?<=b)b', 'b', 'HP');
+
+-- doing 24 "non-greedy quantifiers"
+
+-- expectMatch	24.1  PT	ab+?		abb	ab
+select * from test_regex('ab+?', 'abb', 'PT');
+-- expectMatch	24.2  PT	ab+?c		abbc	abbc
+select * from test_regex('ab+?c', 'abbc', 'PT');
+-- expectMatch	24.3  PT	ab*?		abb	a
+select * from test_regex('ab*?', 'abb', 'PT');
+-- expectMatch	24.4  PT	ab*?c		abbc	abbc
+select * from test_regex('ab*?c', 'abbc', 'PT');
+-- expectMatch	24.5  PT	ab??		ab	a
+select * from test_regex('ab??', 'ab', 'PT');
+-- expectMatch	24.6  PT	ab??c		abc	abc
+select * from test_regex('ab??c', 'abc', 'PT');
+-- expectMatch	24.7  PQT	"ab{2,4}?"	abbbb	abb
+select * from test_regex('ab{2,4}?', 'abbbb', 'PQT');
+-- expectMatch	24.8  PQT	"ab{2,4}?c"	abbbbc	abbbbc
+select * from test_regex('ab{2,4}?c', 'abbbbc', 'PQT');
+-- expectMatch	24.9  -		3z*		123zzzz456	3zzzz
+select * from test_regex('3z*', '123zzzz456', '-');
+-- expectMatch	24.10 PT	3z*?		123zzzz456	3
+select * from test_regex('3z*?', '123zzzz456', 'PT');
+-- expectMatch	24.11 -		z*4		123zzzz456	zzzz4
+select * from test_regex('z*4', '123zzzz456', '-');
+-- expectMatch	24.12 PT	z*?4		123zzzz456	zzzz4
+select * from test_regex('z*?4', '123zzzz456', 'PT');
+-- expectMatch	24.13 PT	{^([^/]+?)(?:/([^/]+?))(?:/([^/]+?))?$}	{foo/bar/baz}	{foo/bar/baz} {foo} {bar} {baz}
+select * from test_regex('^([^/]+?)(?:/([^/]+?))(?:/([^/]+?))?$', 'foo/bar/baz', 'PT');
+
+-- doing 25 "mixed quantifiers"
+-- # this is very incomplete as yet
+-- # should include |
+
+-- expectMatch	25.1 PNT	{^(.*?)(a*)$}	"xyza"	xyza	xyz	a
+select * from test_regex('^(.*?)(a*)$', 'xyza', 'PNT');
+-- expectMatch	25.2 PNT	{^(.*?)(a*)$}	"xyzaa"	xyzaa	xyz	aa
+select * from test_regex('^(.*?)(a*)$', 'xyzaa', 'PNT');
+-- expectMatch	25.3 PNT	{^(.*?)(a*)$}	"xyz"	xyz	xyz	""
+select * from test_regex('^(.*?)(a*)$', 'xyz', 'PNT');
+
+-- doing 26 "tricky cases"
+
+-- # attempts to trick the matcher into accepting a short match
+-- expectMatch	26.1 -		(week|wee)(night|knights) \
+-- 	"weeknights" weeknights wee knights
+select * from test_regex('(week|wee)(night|knights)', 'weeknights', '-');
+-- expectMatch	26.2 RP		{a(bc*).*\1}	abccbccb abccbccb	b
+select * from test_regex('a(bc*).*\1', 'abccbccb', 'RP');
+-- expectMatch	26.3 -		{a(b.[bc]*)+}	abcbd	abcbd	bd
+select * from test_regex('a(b.[bc]*)+', 'abcbd', '-');
+
+-- doing 27 "implementation misc."
+
+-- # duplicate arcs are suppressed
+-- expectMatch	27.1 P		a(?:b|b)c	abc	abc
+select * from test_regex('a(?:b|b)c', 'abc', 'P');
+-- # make color/subcolor relationship go back and forth
+-- expectMatch	27.2 &		{[ab][ab][ab]}	aba	aba
+select * from test_regex('[ab][ab][ab]', 'aba', '');
+select * from test_regex('[ab][ab][ab]', 'aba', 'b');
+-- expectMatch	27.3 &		{[ab][ab][ab][ab][ab][ab][ab]} \
+-- 	"abababa" abababa
+select * from test_regex('[ab][ab][ab][ab][ab][ab][ab]', 'abababa', '');
+select * from test_regex('[ab][ab][ab][ab][ab][ab][ab]', 'abababa', 'b');
+
+-- doing 28 "boundary busters etc."
+
+-- # color-descriptor allocation changes at 10
+-- expectMatch	28.1 &		abcdefghijkl	"abcdefghijkl"	abcdefghijkl
+select * from test_regex('abcdefghijkl', 'abcdefghijkl', '');
+select * from test_regex('abcdefghijkl', 'abcdefghijkl', 'b');
+-- # so does arc allocation
+-- expectMatch	28.2 P		a(?:b|c|d|e|f|g|h|i|j|k|l|m)n	"agn"	agn
+select * from test_regex('a(?:b|c|d|e|f|g|h|i|j|k|l|m)n', 'agn', 'P');
+-- # subexpression tracking also at 10
+-- expectMatch	28.3 -		a(((((((((((((b)))))))))))))c \
+-- 	"abc" abc b b b b b b b b b b b b b
+select * from test_regex('a(((((((((((((b)))))))))))))c', 'abc', '-');
+-- # state-set handling changes slightly at unsigned size (might be 64...)
+-- # (also stresses arc allocation)
+-- expectMatch	28.4  Q		"ab{1,100}c"	abbc	abbc
+select * from test_regex('ab{1,100}c', 'abbc', 'Q');
+-- expectMatch	28.5  Q		"ab{1,100}c" \
+-- 	"abbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbc" \
+-- 	abbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbc
+select * from test_regex('ab{1,100}c', 'abbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbc', 'Q');
+-- expectMatch	28.6  Q		"ab{1,100}c" \
+-- 	"abbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbc"\
+-- 	abbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbc
+select * from test_regex('ab{1,100}c', 'abbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbc', 'Q');
+-- # force small cache and bust it, several ways
+-- expectMatch	28.7  LP	{\w+abcdefgh}	xyzabcdefgh	xyzabcdefgh
+select * from test_regex('\w+abcdefgh', 'xyzabcdefgh', 'LP');
+-- expectMatch	28.8  %LP	{\w+abcdefgh}	xyzabcdefgh	xyzabcdefgh
+select * from test_regex('\w+abcdefgh', 'xyzabcdefgh', '%LP');
+-- expectMatch	28.9  %LP	{\w+abcdefghijklmnopqrst} \
+-- 	"xyzabcdefghijklmnopqrst" xyzabcdefghijklmnopqrst
+select * from test_regex('\w+abcdefghijklmnopqrst', 'xyzabcdefghijklmnopqrst', '%LP');
+-- expectIndices	28.10 %LP	{\w+(abcdefgh)?} xyz	{0 2}	{-1 -1}
+select * from test_regex('\w+(abcdefgh)?', 'xyz', '0%LP');
+-- expectIndices	28.11 %LP	{\w+(abcdefgh)?} xyzabcdefg	{0 9}	{-1 -1}
+select * from test_regex('\w+(abcdefgh)?', 'xyzabcdefg', '0%LP');
+-- expectIndices	28.12 %LP	{\w+(abcdefghijklmnopqrst)?} \
+-- 	"xyzabcdefghijklmnopqrs" {0 21} {-1 -1}
+select * from test_regex('\w+(abcdefghijklmnopqrst)?', 'xyzabcdefghijklmnopqrs', '0%LP');
+
+-- doing 29 "incomplete matches"
+
+-- expectPartial		29.1  t		def	abc	{3 2}	""
+select * from test_regex('def', 'abc', '0!t');
+-- expectPartial		29.2  t		bcd	abc	{1 2}	""
+select * from test_regex('bcd', 'abc', '0!t');
+-- expectPartial		29.3  t		abc	abab	{0 3}	""
+select * from test_regex('abc', 'abab', '0!t');
+-- expectPartial		29.4  t		abc	abdab	{3 4}	""
+select * from test_regex('abc', 'abdab', '0!t');
+-- expectIndices		29.5  t		abc	abc	{0 2}	{0 2}
+select * from test_regex('abc', 'abc', '0t');
+-- expectIndices		29.6  t		abc	xyabc	{2 4}	{2 4}
+select * from test_regex('abc', 'xyabc', '0t');
+-- expectPartial		29.7  t		abc+	xyab	{2 3}	""
+select * from test_regex('abc+', 'xyab', '0!t');
+-- expectIndices		29.8  t		abc+	xyabc	{2 4}	{2 4}
+select * from test_regex('abc+', 'xyabc', '0t');
+-- knownBug expectIndices	29.9  t		abc+	xyabcd	{2 4}	{6 5}
+select * from test_regex('abc+', 'xyabcd', '0t');
+-- expectIndices		29.10 t		abc+	xyabcdd	{2 4}	{7 6}
+select * from test_regex('abc+', 'xyabcdd', '0t');
+-- expectPartial		29.11 tPT	abc+?	xyab	{2 3}	""
+select * from test_regex('abc+?', 'xyab', '0!tPT');
+-- # the retain numbers in these two may look wrong, but they aren't
+-- expectIndices		29.12 tPT	abc+?	xyabc	{2 4}	{5 4}
+select * from test_regex('abc+?', 'xyabc', '0tPT');
+-- expectIndices		29.13 tPT	abc+?	xyabcc	{2 4}	{6 5}
+select * from test_regex('abc+?', 'xyabcc', '0tPT');
+-- expectIndices		29.14 tPT	abc+?	xyabcd	{2 4}	{6 5}
+select * from test_regex('abc+?', 'xyabcd', '0tPT');
+-- expectIndices		29.15 tPT	abc+?	xyabcdd	{2 4}	{7 6}
+select * from test_regex('abc+?', 'xyabcdd', '0tPT');
+-- expectIndices		29.16 t		abcd|bc	xyabc	{3 4}	{2 4}
+select * from test_regex('abcd|bc', 'xyabc', '0t');
+-- expectPartial		29.17 tn	.*k	"xx\nyyy"	{3 5}	""
+select * from test_regex('.*k', E'xx\nyyy', '0!tn');
+
+-- doing 30 "misc. oddities and old bugs"
+
+-- expectError	30.1 &		***	BADRPT
+select * from test_regex('***', '', '');
+select * from test_regex('***', '', 'b');
+-- expectMatch	30.2 N		a?b*	abb	abb
+select * from test_regex('a?b*', 'abb', 'N');
+-- expectMatch	30.3 N		a?b*	bb	bb
+select * from test_regex('a?b*', 'bb', 'N');
+-- expectMatch	30.4 &		a*b	aab	aab
+select * from test_regex('a*b', 'aab', '');
+select * from test_regex('a*b', 'aab', 'b');
+-- expectMatch	30.5 &		^a*b	aaaab	aaaab
+select * from test_regex('^a*b', 'aaaab', '');
+select * from test_regex('^a*b', 'aaaab', 'b');
+-- expectMatch	30.6 &M		{[0-6][1-2][0-3][0-6][1-6][0-6]} \
+-- 	"010010" 010010
+select * from test_regex('[0-6][1-2][0-3][0-6][1-6][0-6]', '010010', 'M');
+select * from test_regex('[0-6][1-2][0-3][0-6][1-6][0-6]', '010010', 'Mb');
+-- # temporary REG_BOSONLY kludge
+-- expectMatch	30.7 s		abc	abcd	abc
+select * from test_regex('abc', 'abcd', 's');
+-- expectNomatch	30.8 s		abc	xabcd
+select * from test_regex('abc', 'xabcd', 's');
+-- # back to normal stuff
+-- expectMatch	30.9 HLP	{(?n)^(?![t#])\S+} \
+-- 	"tk\n\n#\n#\nit0"	it0
+select * from test_regex('(?n)^(?![t#])\S+', E'tk\n\n#\n#\nit0', 'HLP');
+
+-- # Now for tests *not* written by Henry Spencer
+
+-- # Tests resulting from bugs reported by users
+-- test reg-31.1 {[[:xdigit:]] behaves correctly when followed by [[:space:]]} {
+--     set str {2:::DebugWin32}
+--     set re {([[:xdigit:]])([[:space:]]*)}
+--     list [regexp $re $str match xdigit spaces] $match $xdigit $spaces
+--     # Code used to produce {1 2:::DebugWin32 2 :::DebugWin32} !!!
+-- } {1 2 2 {}}
+select * from test_regex('([[:xdigit:]])([[:space:]]*)', '2:::DebugWin32', 'L');
+
+-- test reg-32.1 {canmatch functionality -- at end} testregexp {
+--     set pat {blah}
+--     set line "asd asd"
+--     # can match at the final d, if '%' follows
+--     set res [testregexp -xflags -- c $pat $line resvar]
+--     lappend res $resvar
+-- } {0 7}
+select * from test_regex('blah', 'asd asd', 'c');
+
+-- test reg-32.2 {canmatch functionality -- at end} testregexp {
+--     set pat {s%$}
+--     set line "asd asd"
+--     # can only match after the end of the string
+--     set res [testregexp -xflags -- c $pat $line resvar]
+--     lappend res $resvar
+-- } {0 7}
+select * from test_regex('s%$', 'asd asd', 'c');
+
+-- test reg-32.3 {canmatch functionality -- not last char} testregexp {
+--     set pat {[^d]%$}
+--     set line "asd asd"
+--     # can only match after the end of the string
+--     set res [testregexp -xflags -- c $pat $line resvar]
+--     lappend res $resvar
+-- } {0 7}
+select * from test_regex('[^d]%$', 'asd asd', 'c');
+
+-- test reg-32.3.1 {canmatch functionality -- no match} testregexp {
+--     set pat {\Zx}
+--     set line "asd asd"
+--     # can match the last char, if followed by x
+--     set res [testregexp -xflags -- c $pat $line resvar]
+--     lappend res $resvar
+-- } {0 -1}
+select * from test_regex('\Zx', 'asd asd', 'cIP');
+
+-- test reg-32.4 {canmatch functionality -- last char} {knownBug testregexp} {
+--     set pat {.x}
+--     set line "asd asd"
+--     # can match the last char, if followed by x
+--     set res [testregexp -xflags -- c $pat $line resvar]
+--     lappend res $resvar
+-- } {0 6}
+select * from test_regex('.x', 'asd asd', 'c');
+
+-- test reg-32.4.1 {canmatch functionality -- last char} {knownBug testregexp} {
+--     set pat {.x$}
+--     set line "asd asd"
+--     # can match the last char, if followed by x
+--     set res [testregexp -xflags -- c $pat $line resvar]
+--     lappend res $resvar
+-- } {0 6}
+select * from test_regex('.x$', 'asd asd', 'c');
+
+-- test reg-32.5 {canmatch functionality -- last char} {knownBug testregexp} {
+--     set pat {.[^d]x$}
+--     set line "asd asd"
+--     # can match the last char, if followed by not-d and x.
+--     set res [testregexp -xflags -- c $pat $line resvar]
+--     lappend res $resvar
+-- } {0 6}
+select * from test_regex('.[^d]x$', 'asd asd', 'c');
+
+-- test reg-32.6 {canmatch functionality -- last char} {knownBug testregexp} {
+--     set pat {[^a]%[^\r\n]*$}
+--     set line "asd asd"
+--     # can match at the final d, if '%' follows
+--     set res [testregexp -xflags -- c $pat $line resvar]
+--     lappend res $resvar
+-- } {0 6}
+select * from test_regex('[^a]%[^\r\n]*$', 'asd asd', 'cEP');
+
+-- test reg-32.7 {canmatch functionality -- last char} {knownBug testregexp} {
+--     set pat {[^a]%$}
+--     set line "asd asd"
+--     # can match at the final d, if '%' follows
+--     set res [testregexp -xflags -- c $pat $line resvar]
+--     lappend res $resvar
+-- } {0 6}
+select * from test_regex('[^a]%$', 'asd asd', 'c');
+
+-- test reg-32.8 {canmatch functionality -- last char} {knownBug testregexp} {
+--     set pat {[^x]%$}
+--     set line "asd asd"
+--     # can match at the final d, if '%' follows
+--     set res [testregexp -xflags -- c $pat $line resvar]
+--     lappend res $resvar
+-- } {0 6}
+select * from test_regex('[^x]%$', 'asd asd', 'c');
+
+-- test reg-32.9 {canmatch functionality -- more complex case} {knownBug testregexp} {
+--     set pat {((\B\B|\Bh+line)[ \t]*|[^\B]%[^\r\n]*)$}
+--     set line "asd asd"
+--     # can match at the final d, if '%' follows
+--     set res [testregexp -xflags -- c $pat $line resvar]
+--     lappend res $resvar
+-- } {0 6}
+select * from test_regex('((\B\B|\Bh+line)[ \t]*|[^\B]%[^\r\n]*)$', 'asd asd', 'cEP');
+
+-- # Tests reg-33.*: Checks for bug fixes
+
+-- test reg-33.1 {Bug 230589} {
+--     regexp {[ ]*(^|[^%])%V} "*%V2" m s
+-- } 1
+select * from test_regex('[ ]*(^|[^%])%V', '*%V2', '-');
+
+-- test reg-33.2 {Bug 504785} {
+--     regexp -inline {([^_.]*)([^.]*)\.(..)(.).*} bbcos_001_c01.q1la
+-- } {bbcos_001_c01.q1la bbcos _001_c01 q1 l}
+select * from test_regex('([^_.]*)([^.]*)\.(..)(.).*', 'bbcos_001_c01.q1la', '-');
+
+-- test reg-33.3 {Bug 505048} {
+--     regexp {\A\s*[^<]*\s*<([^>]+)>} a<a>
+-- } 1
+select * from test_regex('\A\s*[^<]*\s*<([^>]+)>', 'a<a>', 'LP');
+
+-- test reg-33.4 {Bug 505048} {
+--     regexp {\A\s*([^b]*)b} ab
+-- } 1
+select * from test_regex('\A\s*([^b]*)b', 'ab', 'LP');
+
+-- test reg-33.5 {Bug 505048} {
+--     regexp {\A\s*[^b]*(b)} ab
+-- } 1
+select * from test_regex('\A\s*[^b]*(b)', 'ab', 'LP');
+
+-- test reg-33.6 {Bug 505048} {
+--     regexp {\A(\s*)[^b]*(b)} ab
+-- } 1
+select * from test_regex('\A(\s*)[^b]*(b)', 'ab', 'LP');
+
+-- test reg-33.7 {Bug 505048} {
+--     regexp {\A\s*[^b]*b} ab
+-- } 1
+select * from test_regex('\A\s*[^b]*b', 'ab', 'LP');
+
+-- test reg-33.8 {Bug 505048} {
+--     regexp -inline {\A\s*[^b]*b} ab
+-- } ab
+select * from test_regex('\A\s*[^b]*b', 'ab', 'LP');
+
+-- test reg-33.9 {Bug 505048} {
+--     regexp -indices -inline {\A\s*[^b]*b} ab
+-- } {{0 1}}
+select * from test_regex('\A\s*[^b]*b', 'ab', '0LP');
+
+-- test reg-33.10 {Bug 840258} -body {
+--     regsub {(^|\n)+\.*b} \n.b {} tmp
+-- } -cleanup {
+--     unset tmp
+-- } -result 1
+select * from test_regex('(^|\n)+\.*b', E'\n.b', 'P');
+
+-- test reg-33.11 {Bug 840258} -body {
+--     regsub {(^|[\n\r]+)\.*\?<.*?(\n|\r)+} \
+-- 	    "TQ\r\n.?<5000267>Test already stopped\r\n" {} tmp
+-- } -cleanup {
+--     unset tmp
+-- } -result 1
+select * from test_regex('(^|[\n\r]+)\.*\?<.*?(\n|\r)+', E'TQ\r\n.?<5000267>Test already stopped\r\n', 'EP');
+
+-- test reg-33.12 {Bug 1810264 - bad read} {
+--     regexp {\3161573148} {\3161573148}
+-- } 0
+select * from test_regex('\3161573148', '\3161573148', 'MP');
+
+-- test reg-33.13 {Bug 1810264 - infinite loop} {
+--     regexp {($|^)*} {x}
+-- } 1
+select * from test_regex('($|^)*', 'x', 'N');
+
+-- # Some environments have small default stack sizes. [Bug 1905562]
+-- test reg-33.14 {Bug 1810264 - super-expensive expression} nonPortable {
+--     regexp {(x{200}){200}$y} {x}
+-- } 0
+-- This might or might not work depending on platform, so skip it
+-- select * from test_regex('(x{200}){200}$y', 'x', 'IQ');
+
+-- test reg-33.15.1 {Bug 3603557 - an "in the wild" RE} {
+--     lindex [regexp -expanded -about {
+-- 	^TETRA_MODE_CMD				# Message Type
+-- 	([[:blank:]]+)				# Pad
+-- 	(ETS_1_1|ETS_1_2|ETS_2_2)		# SystemCode
+-- 	([[:blank:]]+)				# Pad
+-- 	(CONTINUOUS|CARRIER|MCCH|TRAFFIC)	# SharingMode
+-- 	([[:blank:]]+)				# Pad
+-- 	([[:digit:]]{1,2})			# ColourCode
+-- 	([[:blank:]]+)				# Pad
+-- 	(1|2|3|4|6|9|12|18)			# TSReservedFrames
+-- 	([[:blank:]]+)				# Pad
+-- 	(PASS|TRUE|FAIL|FALSE)			# UPlaneDTX
+-- 	([[:blank:]]+)				# Pad
+-- 	(PASS|TRUE|FAIL|FALSE)			# Frame18Extension
+-- 	([[:blank:]]+)				# Pad
+-- 	([[:digit:]]{1,4})			# MCC
+-- 	([[:blank:]]+)				# Pad
+-- 	([[:digit:]]{1,5})			# MNC
+-- 	([[:blank:]]+)				# Pad
+-- 	(BOTH|BCAST|ENQRY|NONE)			# NbrCellBcast
+-- 	([[:blank:]]+)				# Pad
+-- 	(UNKNOWN|LOW|MEDIUM|HIGH)		# CellServiceLevel
+-- 	([[:blank:]]+)				# Pad
+-- 	(PASS|TRUE|FAIL|FALSE)			# LateEntryInfo
+-- 	([[:blank:]]+)				# Pad
+-- 	(300|400)				# FrequencyBand
+-- 	([[:blank:]]+)				# Pad
+-- 	(NORMAL|REVERSE)			# ReverseOperation
+-- 	([[:blank:]]+)				# Pad
+-- 	(NONE|\+6\.25|\-6\.25|\+12\.5)		# Offset
+-- 	([[:blank:]]+)				# Pad
+-- 	(10)					# DuplexSpacing
+-- 	([[:blank:]]+)				# Pad
+-- 	([[:digit:]]{1,4})			# MainCarrierNr
+-- 	([[:blank:]]+)				# Pad
+-- 	(0|1|2|3)				# NrCSCCH
+-- 	([[:blank:]]+)				# Pad
+-- 	(15|20|25|30|35|40|45)			# MSTxPwrMax
+-- 	([[:blank:]]+)				# Pad
+-- 	(\-125|\-120|\-115|\-110|\-105|\-100|\-95|\-90|\-85|\-80|\-75|\-70|\-65|\-60|\-55|\-50)
+-- 						# RxLevAccessMin
+-- 	([[:blank:]]+)				# Pad
+-- 	(\-53|\-51|\-49|\-47|\-45|\-43|\-41|\-39|\-37|\-35|\-33|\-31|\-29|\-27|\-25|\-23)
+-- 						# AccessParameter
+-- 	([[:blank:]]+)				# Pad
+-- 	(DISABLE|[[:digit:]]{3,4})		# RadioDLTimeout
+-- 	([[:blank:]]+)				# Pad
+-- 	(\-[[:digit:]]{2,3})			# RSSIThreshold
+-- 	([[:blank:]]+)				# Pad
+-- 	([[:digit:]]{1,5})			# CCKIdSCKVerNr
+-- 	([[:blank:]]+)				# Pad
+-- 	([[:digit:]]{1,5})			# LocationArea
+-- 	([[:blank:]]+)				# Pad
+-- 	([(1|0)]{16})				# SubscriberClass
+-- 	([[:blank:]]+)				# Pad
+-- 	([(1|0)]{12})				# BSServiceDetails
+-- 	([[:blank:]]+)				# Pad
+-- 	(RANDOMIZE|IMMEDIATE|[[:digit:]]{1,2})	# IMM
+-- 	([[:blank:]]+)				# Pad
+-- 	([[:digit:]]{1,2})			# WT
+-- 	([[:blank:]]+)				# Pad
+-- 	([[:digit:]]{1,2})			# Nu
+-- 	([[:blank:]]+)				# Pad
+-- 	([0-1])					# FrameLngFctr
+-- 	([[:blank:]]+)				# Pad
+-- 	([[:digit:]]{1,2})			# TSPtr
+-- 	([[:blank:]]+)				# Pad
+-- 	([0-7])					# MinPriority
+-- 	([[:blank:]]+)				# Pad
+-- 	(PASS|TRUE|FAIL|FALSE)			# ExtdSrvcsEnabled
+-- 	([[:blank:]]+)				# Pad
+-- 	(.*)					# ConditionalFields
+--     }] 0
+-- } 68
+select * from test_regex($$
+	^TETRA_MODE_CMD				# Message Type
+	([[:blank:]]+)				# Pad
+	(ETS_1_1|ETS_1_2|ETS_2_2)		# SystemCode
+	([[:blank:]]+)				# Pad
+	(CONTINUOUS|CARRIER|MCCH|TRAFFIC)	# SharingMode
+	([[:blank:]]+)				# Pad
+	([[:digit:]]{1,2})			# ColourCode
+	([[:blank:]]+)				# Pad
+	(1|2|3|4|6|9|12|18)			# TSReservedFrames
+	([[:blank:]]+)				# Pad
+	(PASS|TRUE|FAIL|FALSE)			# UPlaneDTX
+	([[:blank:]]+)				# Pad
+	(PASS|TRUE|FAIL|FALSE)			# Frame18Extension
+	([[:blank:]]+)				# Pad
+	([[:digit:]]{1,4})			# MCC
+	([[:blank:]]+)				# Pad
+	([[:digit:]]{1,5})			# MNC
+	([[:blank:]]+)				# Pad
+	(BOTH|BCAST|ENQRY|NONE)			# NbrCellBcast
+	([[:blank:]]+)				# Pad
+	(UNKNOWN|LOW|MEDIUM|HIGH)		# CellServiceLevel
+	([[:blank:]]+)				# Pad
+	(PASS|TRUE|FAIL|FALSE)			# LateEntryInfo
+	([[:blank:]]+)				# Pad
+	(300|400)				# FrequencyBand
+	([[:blank:]]+)				# Pad
+	(NORMAL|REVERSE)			# ReverseOperation
+	([[:blank:]]+)				# Pad
+	(NONE|\+6\.25|\-6\.25|\+12\.5)		# Offset
+	([[:blank:]]+)				# Pad
+	(10)					# DuplexSpacing
+	([[:blank:]]+)				# Pad
+	([[:digit:]]{1,4})			# MainCarrierNr
+	([[:blank:]]+)				# Pad
+	(0|1|2|3)				# NrCSCCH
+	([[:blank:]]+)				# Pad
+	(15|20|25|30|35|40|45)			# MSTxPwrMax
+	([[:blank:]]+)				# Pad
+	(\-125|\-120|\-115|\-110|\-105|\-100|\-95|\-90|\-85|\-80|\-75|\-70|\-65|\-60|\-55|\-50)
+						# RxLevAccessMin
+	([[:blank:]]+)				# Pad
+	(\-53|\-51|\-49|\-47|\-45|\-43|\-41|\-39|\-37|\-35|\-33|\-31|\-29|\-27|\-25|\-23)
+						# AccessParameter
+	([[:blank:]]+)				# Pad
+	(DISABLE|[[:digit:]]{3,4})		# RadioDLTimeout
+	([[:blank:]]+)				# Pad
+	(\-[[:digit:]]{2,3})			# RSSIThreshold
+	([[:blank:]]+)				# Pad
+	([[:digit:]]{1,5})			# CCKIdSCKVerNr
+	([[:blank:]]+)				# Pad
+	([[:digit:]]{1,5})			# LocationArea
+	([[:blank:]]+)				# Pad
+	([(1|0)]{16})				# SubscriberClass
+	([[:blank:]]+)				# Pad
+	([(1|0)]{12})				# BSServiceDetails
+	([[:blank:]]+)				# Pad
+	(RANDOMIZE|IMMEDIATE|[[:digit:]]{1,2})	# IMM
+	([[:blank:]]+)				# Pad
+	([[:digit:]]{1,2})			# WT
+	([[:blank:]]+)				# Pad
+	([[:digit:]]{1,2})			# Nu
+	([[:blank:]]+)				# Pad
+	([0-1])					# FrameLngFctr
+	([[:blank:]]+)				# Pad
+	([[:digit:]]{1,2})			# TSPtr
+	([[:blank:]]+)				# Pad
+	([0-7])					# MinPriority
+	([[:blank:]]+)				# Pad
+	(PASS|TRUE|FAIL|FALSE)			# ExtdSrvcsEnabled
+	([[:blank:]]+)				# Pad
+	(.*)					# ConditionalFields
+    $$, '', 'xLMPQ');
+
+-- test reg-33.16.1 {Bug [8d2c0da36d]- another "in the wild" RE} {
+--     lindex [regexp -about "^MRK:client1: =1339 14HKelly Talisman 10011000 (\[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]*) \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* 8 0 8 0 0 0 77 77 1 1 2 0 11 { 1 3 8 \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* 00000000 1 13HC6 My Creator 2 3 8 \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* 00000000 1 31HC7 Slightly offensive name, huh 3 8 8 \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* 00000000 1 23HE-mail:kelly@hotbox.com 4 9 8 \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* 00000000 1 17Hcompface must die 5 10 8 \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* 00000000 0 3HAir 6 12 8 \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* 00000000 1 14HPGP public key 7 13 8 \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* 00000000 1 16Hkelly@hotbox.com 8 30 8 \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* 00000000 0 12H2 text/plain 9 30 8 \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* 00000000 0 13H2 x-kom/basic 10 33 8 \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* 00000000 1 1H0 11 14 8 \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* \[0-9\]* 00000000 1 1H3 }\r?"] 0
+-- } 1
+select * from test_regex(E'^MRK:client1: =1339 14HKelly Talisman 10011000 ([0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]*) [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* 8 0 8 0 0 0 77 77 1 1 2 0 11 { 1 3 8 [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* 00000000 1 13HC6 My Creator 2 3 8 [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* 00000000 1 31HC7 Slightly offensive name, huh 3 8 8 [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* 00000000 1 23HE-mail:kelly@hotbox.com 4 9 8 [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* 00000000 1 17Hcompface must die 5 10 8 [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* 00000000 0 3HAir 6 12 8 [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* 00000000 1 14HPGP public key 7 13 8 [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* 00000000 1 16Hkelly@hotbox.com 8 30 8 [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* 00000000 0 12H2 text/plain 9 30 8 [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* 00000000 0 13H2 x-kom/basic 10 33 8 [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* 00000000 1 1H0 11 14 8 [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* [0-9]* 00000000 1 1H3 }\r?', '', 'BMS');
+
+-- test reg-33.15 {constraint fixes} {
+--     regexp {(^)+^} x
+-- } 1
+select * from test_regex('(^)+^', 'x', 'N');
+
+-- test reg-33.16 {constraint fixes} {
+--     regexp {($^)+} x
+-- } 0
+select * from test_regex('($^)+', 'x', 'N');
+
+-- test reg-33.17 {constraint fixes} {
+--     regexp {(^$)*} x
+-- } 1
+select * from test_regex('(^$)*', 'x', 'N');
+
+-- test reg-33.18 {constraint fixes} {
+--     regexp {(^(?!aa))+} {aa bb cc}
+-- } 0
+select * from test_regex('(^(?!aa))+', 'aa bb cc', 'HP');
+
+-- test reg-33.19 {constraint fixes} {
+--     regexp {(^(?!aa)(?!bb)(?!cc))+} {aa x}
+-- } 0
+select * from test_regex('(^(?!aa)(?!bb)(?!cc))+', 'aa x', 'HP');
+
+-- test reg-33.20 {constraint fixes} {
+--     regexp {(^(?!aa)(?!bb)(?!cc))+} {bb x}
+-- } 0
+select * from test_regex('(^(?!aa)(?!bb)(?!cc))+', 'bb x', 'HP');
+
+-- test reg-33.21 {constraint fixes} {
+--     regexp {(^(?!aa)(?!bb)(?!cc))+} {cc x}
+-- } 0
+select * from test_regex('(^(?!aa)(?!bb)(?!cc))+', 'cc x', 'HP');
+
+-- test reg-33.22 {constraint fixes} {
+--     regexp {(^(?!aa)(?!bb)(?!cc))+} {dd x}
+-- } 1
+select * from test_regex('(^(?!aa)(?!bb)(?!cc))+', 'dd x', 'HP');
+
+-- test reg-33.23 {} {
+--     regexp {abcd(\m)+xyz} x
+-- } 0
+select * from test_regex('abcd(\m)+xyz', 'x', 'ILP');
+
+-- test reg-33.24 {} {
+--     regexp {abcd(\m)+xyz} a
+-- } 0
+select * from test_regex('abcd(\m)+xyz', 'a', 'ILP');
+
+-- test reg-33.25 {} {
+--     regexp {^abcd*(((((^(a c(e?d)a+|)+|)+|)+|)+|a)+|)} x
+-- } 0
+select * from test_regex('^abcd*(((((^(a c(e?d)a+|)+|)+|)+|)+|a)+|)', 'x', 'S');
+
+-- test reg-33.26 {} {
+--     regexp {a^(^)bcd*xy(((((($a+|)+|)+|)+$|)+|)+|)^$} x
+-- } 0
+select * from test_regex('a^(^)bcd*xy(((((($a+|)+|)+|)+$|)+|)+|)^$', 'x', 'IS');
+
+-- test reg-33.27 {} {
+--     regexp {xyz(\Y\Y)+} x
+-- } 0
+select * from test_regex('xyz(\Y\Y)+', 'x', 'LP');
+
+-- test reg-33.28 {} {
+--     regexp {x|(?:\M)+} x
+-- } 1
+select * from test_regex('x|(?:\M)+', 'x', 'LNP');
+
+-- test reg-33.29 {} {
+--     # This is near the limits of the RE engine
+--     regexp [string repeat x*y*z* 480] x
+-- } 1
+-- The runtime cost of this seems out of proportion to the value,
+-- so for Postgres purposes reduce the repeat to 200x
+select * from test_regex(repeat('x*y*z*', 200), 'x', 'N');
+
+-- test reg-33.30 {Bug 1080042} {
+--     regexp {(\Y)+} foo
+-- } 1
+select * from test_regex('(\Y)+', 'foo', 'LNP');
diff --git a/src/test/modules/test_regex/sql/test_regex_utf8.sql b/src/test/modules/test_regex/sql/test_regex_utf8.sql
new file mode 100644
index 0000000000..cfd9396194
--- /dev/null
+++ b/src/test/modules/test_regex/sql/test_regex_utf8.sql
@@ -0,0 +1,60 @@
+/*
+ * This test must be run in a database with UTF-8 encoding,
+ * because other encodings don't support all the characters used.
+ */
+
+SELECT getdatabaseencoding() <> 'UTF8'
+       AS skip_test \gset
+\if :skip_test
+\quit
+\endif
+
+set client_encoding = utf8;
+
+set standard_conforming_strings = on;
+
+
+-- Run the Tcl test cases that require Unicode
+
+-- expectMatch	9.44 EMP*	{a[\u00fe-\u0507][\u00ff-\u0300]b} \
+-- 	"a\u0102\u02ffb"	"a\u0102\u02ffb"
+select * from test_regex('a[\u00fe-\u0507][\u00ff-\u0300]b', E'a\u0102\u02ffb', 'EMP*');
+
+-- expectMatch	13.27 P		"a\\U00001234x"	"a\u1234x"	"a\u1234x"
+select * from test_regex('a\U00001234x', E'a\u1234x', 'P');
+-- expectMatch	13.28 P		{a\U00001234x}	"a\u1234x"	"a\u1234x"
+select * from test_regex('a\U00001234x', E'a\u1234x', 'P');
+-- expectMatch	13.29 P		"a\\U0001234x"	"a\u1234x"	"a\u1234x"
+-- Tcl has relaxed their code to allow 1-8 hex digits, but Postgres hasn't
+select * from test_regex('a\U0001234x', E'a\u1234x', 'P');
+-- expectMatch	13.30 P		{a\U0001234x}	"a\u1234x"	"a\u1234x"
+-- Tcl has relaxed their code to allow 1-8 hex digits, but Postgres hasn't
+select * from test_regex('a\U0001234x', E'a\u1234x', 'P');
+-- expectMatch	13.31 P		"a\\U000012345x"	"a\u12345x"	"a\u12345x"
+select * from test_regex('a\U000012345x', E'a\u12345x', 'P');
+-- expectMatch	13.32 P		{a\U000012345x}	"a\u12345x"	"a\u12345x"
+select * from test_regex('a\U000012345x', E'a\u12345x', 'P');
+-- expectMatch	13.33 P		"a\\U1000000x"	"a\ufffd0x"	"a\ufffd0x"
+-- Tcl allows this as a standalone character, but Postgres doesn't
+select * from test_regex('a\U1000000x', E'a\ufffd0x', 'P');
+-- expectMatch	13.34 P		{a\U1000000x}	"a\ufffd0x"	"a\ufffd0x"
+-- Tcl allows this as a standalone character, but Postgres doesn't
+select * from test_regex('a\U1000000x', E'a\ufffd0x', 'P');
+
+
+-- Additional tests, not derived from Tcl
+
+-- Exercise logic around high character ranges a bit more
+select * from test_regex('a
+  [\u1000-\u1100]*
+  [\u3000-\u3100]*
+  [\u1234-\u25ff]+
+  [\u2000-\u35ff]*
+  [\u2600-\u2f00]*
+  \u1236\u1236x',
+  E'a\u1234\u1236\u1236x', 'xEMP');
+
+select * from test_regex('[[:alnum:]]*[[:upper:]]*[\u1000-\u2000]*\u1237',
+  E'\u1500\u1237', 'ELMP');
+select * from test_regex('[[:alnum:]]*[[:upper:]]*[\u1000-\u2000]*\u1237',
+  E'A\u1239', 'ELMP');
diff --git a/src/test/modules/test_regex/test_regex--1.0.sql b/src/test/modules/test_regex/test_regex--1.0.sql
new file mode 100644
index 0000000000..7d991537f4
--- /dev/null
+++ b/src/test/modules/test_regex/test_regex--1.0.sql
@@ -0,0 +1,9 @@
+/* src/test/modules/test_regex/test_regex--1.0.sql */
+
+-- complain if script is sourced in psql, rather than via CREATE EXTENSION
+\echo Use "CREATE EXTENSION test_regex" to load this file. \quit
+
+CREATE FUNCTION test_regex(pattern text, string text, flags text)
+RETURNS SETOF text[]
+STRICT
+AS 'MODULE_PATHNAME' LANGUAGE C;
diff --git a/src/test/modules/test_regex/test_regex.c b/src/test/modules/test_regex/test_regex.c
new file mode 100644
index 0000000000..ad3c6d3b1a
--- /dev/null
+++ b/src/test/modules/test_regex/test_regex.c
@@ -0,0 +1,759 @@
+/*--------------------------------------------------------------------------
+ *
+ * test_regex.c
+ *		Test harness for the regular expression package.
+ *
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *		src/test/modules/test_regex/test_regex.c
+ *
+ * -------------------------------------------------------------------------
+ */
+
+#include "postgres.h"
+
+#include "funcapi.h"
+#include "miscadmin.h"
+#include "regex/regex.h"
+#include "utils/array.h"
+#include "utils/builtins.h"
+
+PG_MODULE_MAGIC;
+
+
+/* all the options of interest for regex functions */
+typedef struct test_re_flags
+{
+	int			cflags;			/* compile flags for Spencer's regex code */
+	int			eflags;			/* execute flags for Spencer's regex code */
+	long		info;			/* expected re_info bits */
+	bool		glob;			/* do it globally (for each occurrence) */
+	bool		indices;		/* report indices not actual strings */
+	bool		partial;		/* expect partial match */
+} test_re_flags;
+
+/* cross-call state for test_regex() */
+typedef struct test_regex_ctx
+{
+	test_re_flags re_flags;		/* flags */
+	rm_detail_t details;		/* "details" from execution */
+	text	   *orig_str;		/* data string in original TEXT form */
+	int			nmatches;		/* number of places where pattern matched */
+	int			npatterns;		/* number of capturing subpatterns */
+	/* We store start char index and end+1 char index for each match */
+	/* so the number of entries in match_locs is nmatches * npatterns * 2 */
+	int		   *match_locs;		/* 0-based character indexes */
+	int			next_match;		/* 0-based index of next match to process */
+	/* workspace for build_test_match_result() */
+	Datum	   *elems;			/* has npatterns+1 elements */
+	bool	   *nulls;			/* has npatterns+1 elements */
+	pg_wchar   *wide_str;		/* wide-char version of original string */
+	char	   *conv_buf;		/* conversion buffer, if needed */
+	int			conv_bufsiz;	/* size thereof */
+} test_regex_ctx;
+
+/* Local functions */
+static void test_re_compile(text *text_re, int cflags, Oid collation,
+							regex_t *result_re);
+static void parse_test_flags(test_re_flags *flags, text *opts);
+static test_regex_ctx *setup_test_matches(text *orig_str,
+										  regex_t *cpattern,
+										  test_re_flags *flags,
+										  Oid collation,
+										  bool use_subpatterns);
+static ArrayType *build_test_info_result(regex_t *cpattern,
+										 test_re_flags *flags);
+static ArrayType *build_test_match_result(test_regex_ctx *matchctx);
+
+
+/*
+ * test_regex(pattern text, string text, flags text) returns setof text[]
+ *
+ * This is largely based on regexp.c's regexp_matches, with additions
+ * for debugging purposes.
+ */
+PG_FUNCTION_INFO_V1(test_regex);
+
+Datum
+test_regex(PG_FUNCTION_ARGS)
+{
+	FuncCallContext *funcctx;
+	test_regex_ctx *matchctx;
+	ArrayType  *result_ary;
+
+	if (SRF_IS_FIRSTCALL())
+	{
+		text	   *pattern = PG_GETARG_TEXT_PP(0);
+		text	   *flags = PG_GETARG_TEXT_PP(2);
+		Oid			collation = PG_GET_COLLATION();
+		test_re_flags re_flags;
+		regex_t		cpattern;
+		MemoryContext oldcontext;
+
+		funcctx = SRF_FIRSTCALL_INIT();
+		oldcontext = MemoryContextSwitchTo(funcctx->multi_call_memory_ctx);
+
+		/* Determine options */
+		parse_test_flags(&re_flags, flags);
+
+		/* set up the compiled pattern */
+		test_re_compile(pattern, re_flags.cflags, collation, &cpattern);
+
+		/* be sure to copy the input string into the multi-call ctx */
+		matchctx = setup_test_matches(PG_GETARG_TEXT_P_COPY(1), &cpattern,
+									  &re_flags,
+									  collation,
+									  true);
+
+		/* Pre-create workspace that build_test_match_result needs */
+		matchctx->elems = (Datum *) palloc(sizeof(Datum) *
+										   (matchctx->npatterns + 1));
+		matchctx->nulls = (bool *) palloc(sizeof(bool) *
+										  (matchctx->npatterns + 1));
+
+		MemoryContextSwitchTo(oldcontext);
+		funcctx->user_fctx = (void *) matchctx;
+
+		/*
+		 * Return the first result row, which is info equivalent to Tcl's
+		 * "regexp -about" output
+		 */
+		result_ary = build_test_info_result(&cpattern, &re_flags);
+
+		pg_regfree(&cpattern);
+
+		SRF_RETURN_NEXT(funcctx, PointerGetDatum(result_ary));
+	}
+	else
+	{
+		/* Each subsequent row describes one match */
+		funcctx = SRF_PERCALL_SETUP();
+		matchctx = (test_regex_ctx *) funcctx->user_fctx;
+
+		if (matchctx->next_match < matchctx->nmatches)
+		{
+			result_ary = build_test_match_result(matchctx);
+			matchctx->next_match++;
+			SRF_RETURN_NEXT(funcctx, PointerGetDatum(result_ary));
+		}
+	}
+
+	SRF_RETURN_DONE(funcctx);
+}
+
+
+/*
+ * test_re_compile - compile a RE
+ *
+ *	text_re --- the pattern, expressed as a TEXT object
+ *	cflags --- compile options for the pattern
+ *	collation --- collation to use for LC_CTYPE-dependent behavior
+ *  result_re --- output, compiled RE is stored here
+ *
+ * Pattern is given in the database encoding.  We internally convert to
+ * an array of pg_wchar, which is what Spencer's regex package wants.
+ *
+ * Caller must eventually pg_regfree the resulting RE to avoid memory leaks.
+ */
+static void
+test_re_compile(text *text_re, int cflags, Oid collation,
+				regex_t *result_re)
+{
+	int			text_re_len = VARSIZE_ANY_EXHDR(text_re);
+	char	   *text_re_val = VARDATA_ANY(text_re);
+	pg_wchar   *pattern;
+	int			pattern_len;
+	int			regcomp_result;
+	char		errMsg[100];
+
+	/* Convert pattern string to wide characters */
+	pattern = (pg_wchar *) palloc((text_re_len + 1) * sizeof(pg_wchar));
+	pattern_len = pg_mb2wchar_with_len(text_re_val,
+									   pattern,
+									   text_re_len);
+
+	regcomp_result = pg_regcomp(result_re,
+								pattern,
+								pattern_len,
+								cflags,
+								collation);
+
+	pfree(pattern);
+
+	if (regcomp_result != REG_OKAY)
+	{
+		/* re didn't compile (no need for pg_regfree, if so) */
+
+		/*
+		 * Here and in other places in this file, do CHECK_FOR_INTERRUPTS
+		 * before reporting a regex error.  This is so that if the regex
+		 * library aborts and returns REG_CANCEL, we don't print an error
+		 * message that implies the regex was invalid.
+		 */
+		CHECK_FOR_INTERRUPTS();
+
+		pg_regerror(regcomp_result, result_re, errMsg, sizeof(errMsg));
+		ereport(ERROR,
+				(errcode(ERRCODE_INVALID_REGULAR_EXPRESSION),
+				 errmsg("invalid regular expression: %s", errMsg)));
+	}
+}
+
+/*
+ * test_re_execute - execute a RE on pg_wchar data
+ *
+ * Returns true on match, false on no match
+ * Arguments are as for pg_regexec
+ */
+static bool
+test_re_execute(regex_t *re, pg_wchar *data, int data_len,
+				int start_search,
+				rm_detail_t *details,
+				int nmatch, regmatch_t *pmatch,
+				int eflags)
+{
+	int			regexec_result;
+	char		errMsg[100];
+
+	/* Initialize match locations in case engine doesn't */
+	details->rm_extend.rm_so = -1;
+	details->rm_extend.rm_eo = -1;
+	for (int i = 0; i < nmatch; i++)
+	{
+		pmatch[i].rm_so = -1;
+		pmatch[i].rm_eo = -1;
+	}
+
+	/* Perform RE match and return result */
+	regexec_result = pg_regexec(re,
+								data,
+								data_len,
+								start_search,
+								details,
+								nmatch,
+								pmatch,
+								eflags);
+
+	if (regexec_result != REG_OKAY && regexec_result != REG_NOMATCH)
+	{
+		/* re failed??? */
+		CHECK_FOR_INTERRUPTS();
+		pg_regerror(regexec_result, re, errMsg, sizeof(errMsg));
+		ereport(ERROR,
+				(errcode(ERRCODE_INVALID_REGULAR_EXPRESSION),
+				 errmsg("regular expression failed: %s", errMsg)));
+	}
+
+	return (regexec_result == REG_OKAY);
+}
+
+
+/*
+ * parse_test_flags - parse the flags argument
+ *
+ *	flags --- output argument, filled with desired options
+ *	opts --- TEXT object, or NULL for defaults
+ */
+static void
+parse_test_flags(test_re_flags *flags, text *opts)
+{
+	/* these defaults must match Tcl's */
+	int			cflags = REG_ADVANCED;
+	int			eflags = 0;
+	long		info = 0;
+
+	flags->glob = false;
+	flags->indices = false;
+	flags->partial = false;
+
+	if (opts)
+	{
+		char	   *opt_p = VARDATA_ANY(opts);
+		int			opt_len = VARSIZE_ANY_EXHDR(opts);
+		int			i;
+
+		for (i = 0; i < opt_len; i++)
+		{
+			switch (opt_p[i])
+			{
+				case '-':
+					/* allowed, no-op */
+					break;
+				case '!':
+					flags->partial = true;
+					break;
+				case '*':
+					/* test requires Unicode --- ignored here */
+					break;
+				case '0':
+					flags->indices = true;
+					break;
+
+					/* These flags correspond to user-exposed RE options: */
+				case 'g':		/* global match */
+					flags->glob = true;
+					break;
+				case 'i':		/* case insensitive */
+					cflags |= REG_ICASE;
+					break;
+				case 'n':		/* \n affects ^ $ . [^ */
+					cflags |= REG_NEWLINE;
+					break;
+				case 'p':		/* ~Perl, \n affects . [^ */
+					cflags |= REG_NLSTOP;
+					cflags &= ~REG_NLANCH;
+					break;
+				case 'w':		/* weird, \n affects ^ $ only */
+					cflags &= ~REG_NLSTOP;
+					cflags |= REG_NLANCH;
+					break;
+				case 'x':		/* expanded syntax */
+					cflags |= REG_EXPANDED;
+					break;
+
+					/* These flags correspond to Tcl's -xflags options: */
+				case 'a':
+					cflags |= REG_ADVF;
+					break;
+				case 'b':
+					cflags &= ~REG_ADVANCED;
+					break;
+				case 'c':
+
+					/*
+					 * Tcl calls this TCL_REG_CANMATCH, but it's really
+					 * REG_EXPECT.  In this implementation we must also set
+					 * the partial and indices flags, so that
+					 * setup_test_matches and build_test_match_result will
+					 * emit the desired data.  (They'll emit more fields than
+					 * Tcl would, but that's fine.)
+					 */
+					cflags |= REG_EXPECT;
+					flags->partial = true;
+					flags->indices = true;
+					break;
+				case 'e':
+					cflags &= ~REG_ADVANCED;
+					cflags |= REG_EXTENDED;
+					break;
+				case 'q':
+					cflags &= ~REG_ADVANCED;
+					cflags |= REG_QUOTE;
+					break;
+				case 'o':		/* o for opaque */
+					cflags |= REG_NOSUB;
+					break;
+				case 's':		/* s for start */
+					cflags |= REG_BOSONLY;
+					break;
+				case '+':
+					cflags |= REG_FAKE;
+					break;
+				case ',':
+					cflags |= REG_PROGRESS;
+					break;
+				case '.':
+					cflags |= REG_DUMP;
+					break;
+				case ':':
+					eflags |= REG_MTRACE;
+					break;
+				case ';':
+					eflags |= REG_FTRACE;
+					break;
+				case '^':
+					eflags |= REG_NOTBOL;
+					break;
+				case '$':
+					eflags |= REG_NOTEOL;
+					break;
+				case 't':
+					cflags |= REG_EXPECT;
+					break;
+				case '%':
+					eflags |= REG_SMALL;
+					break;
+
+					/* These flags define expected info bits: */
+				case 'A':
+					info |= REG_UBSALNUM;
+					break;
+				case 'B':
+					info |= REG_UBRACES;
+					break;
+				case 'E':
+					info |= REG_UBBS;
+					break;
+				case 'H':
+					info |= REG_ULOOKAROUND;
+					break;
+				case 'I':
+					info |= REG_UIMPOSSIBLE;
+					break;
+				case 'L':
+					info |= REG_ULOCALE;
+					break;
+				case 'M':
+					info |= REG_UUNPORT;
+					break;
+				case 'N':
+					info |= REG_UEMPTYMATCH;
+					break;
+				case 'P':
+					info |= REG_UNONPOSIX;
+					break;
+				case 'Q':
+					info |= REG_UBOUNDS;
+					break;
+				case 'R':
+					info |= REG_UBACKREF;
+					break;
+				case 'S':
+					info |= REG_UUNSPEC;
+					break;
+				case 'T':
+					info |= REG_USHORTEST;
+					break;
+				case 'U':
+					info |= REG_UPBOTCH;
+					break;
+
+				default:
+					ereport(ERROR,
+							(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
+							 errmsg("invalid regular expression test option: \"%.*s\"",
+									pg_mblen(opt_p + i), opt_p + i)));
+					break;
+			}
+		}
+	}
+	flags->cflags = cflags;
+	flags->eflags = eflags;
+	flags->info = info;
+}
+
+/*
+ * setup_test_matches --- do the initial matching
+ *
+ * To simplify memory management, we do all the matching in one swoop.
+ * The returned test_regex_ctx contains the locations of all the substrings
+ * matching the pattern.
+ */
+static test_regex_ctx *
+setup_test_matches(text *orig_str,
+				   regex_t *cpattern, test_re_flags *re_flags,
+				   Oid collation,
+				   bool use_subpatterns)
+{
+	test_regex_ctx *matchctx = palloc0(sizeof(test_regex_ctx));
+	int			eml = pg_database_encoding_max_length();
+	int			orig_len;
+	pg_wchar   *wide_str;
+	int			wide_len;
+	regmatch_t *pmatch;
+	int			pmatch_len;
+	int			array_len;
+	int			array_idx;
+	int			prev_match_end;
+	int			start_search;
+	int			maxlen = 0;		/* largest fetch length in characters */
+
+	/* save flags */
+	matchctx->re_flags = *re_flags;
+
+	/* save original string --- we'll extract result substrings from it */
+	matchctx->orig_str = orig_str;
+
+	/* convert string to pg_wchar form for matching */
+	orig_len = VARSIZE_ANY_EXHDR(orig_str);
+	wide_str = (pg_wchar *) palloc(sizeof(pg_wchar) * (orig_len + 1));
+	wide_len = pg_mb2wchar_with_len(VARDATA_ANY(orig_str), wide_str, orig_len);
+
+	/* do we want to remember subpatterns? */
+	if (use_subpatterns && cpattern->re_nsub > 0)
+	{
+		matchctx->npatterns = cpattern->re_nsub + 1;
+		pmatch_len = cpattern->re_nsub + 1;
+	}
+	else
+	{
+		use_subpatterns = false;
+		matchctx->npatterns = 1;
+		pmatch_len = 1;
+	}
+
+	/* temporary output space for RE package */
+	pmatch = palloc(sizeof(regmatch_t) * pmatch_len);
+
+	/*
+	 * the real output space (grown dynamically if needed)
+	 *
+	 * use values 2^n-1, not 2^n, so that we hit the limit at 2^28-1 rather
+	 * than at 2^27
+	 */
+	array_len = re_flags->glob ? 255 : 31;
+	matchctx->match_locs = (int *) palloc(sizeof(int) * array_len);
+	array_idx = 0;
+
+	/* search for the pattern, perhaps repeatedly */
+	prev_match_end = 0;
+	start_search = 0;
+	while (test_re_execute(cpattern, wide_str, wide_len,
+						   start_search,
+						   &matchctx->details,
+						   pmatch_len, pmatch,
+						   re_flags->eflags))
+	{
+		/* enlarge output space if needed */
+		while (array_idx + matchctx->npatterns * 2 + 1 > array_len)
+		{
+			array_len += array_len + 1; /* 2^n-1 => 2^(n+1)-1 */
+			if (array_len > MaxAllocSize / sizeof(int))
+				ereport(ERROR,
+						(errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
+						 errmsg("too many regular expression matches")));
+			matchctx->match_locs = (int *) repalloc(matchctx->match_locs,
+													sizeof(int) * array_len);
+		}
+
+		/* save this match's locations */
+		for (int i = 0; i < matchctx->npatterns; i++)
+		{
+			int			so = pmatch[i].rm_so;
+			int			eo = pmatch[i].rm_eo;
+
+			matchctx->match_locs[array_idx++] = so;
+			matchctx->match_locs[array_idx++] = eo;
+			if (so >= 0 && eo >= 0 && (eo - so) > maxlen)
+				maxlen = (eo - so);
+		}
+		matchctx->nmatches++;
+		prev_match_end = pmatch[0].rm_eo;
+
+		/* if not glob, stop after one match */
+		if (!re_flags->glob)
+			break;
+
+		/*
+		 * Advance search position.  Normally we start the next search at the
+		 * end of the previous match; but if the match was of zero length, we
+		 * have to advance by one character, or we'd just find the same match
+		 * again.
+		 */
+		start_search = prev_match_end;
+		if (pmatch[0].rm_so == pmatch[0].rm_eo)
+			start_search++;
+		if (start_search > wide_len)
+			break;
+	}
+
+	/*
+	 * If we had no match, but "partial" and "indices" are set, emit the
+	 * details.
+	 */
+	if (matchctx->nmatches == 0 && re_flags->partial && re_flags->indices)
+	{
+		matchctx->match_locs[array_idx++] = matchctx->details.rm_extend.rm_so;
+		matchctx->match_locs[array_idx++] = matchctx->details.rm_extend.rm_eo;
+		/* we don't have pmatch data, so emit -1 */
+		for (int i = 1; i < matchctx->npatterns; i++)
+		{
+			matchctx->match_locs[array_idx++] = -1;
+			matchctx->match_locs[array_idx++] = -1;
+		}
+		matchctx->nmatches++;
+	}
+
+	if (eml > 1)
+	{
+		int64		maxsiz = eml * (int64) maxlen;
+		int			conv_bufsiz;
+
+		/*
+		 * Make the conversion buffer large enough for any substring of
+		 * interest.
+		 *
+		 * Worst case: assume we need the maximum size (maxlen*eml), but take
+		 * advantage of the fact that the original string length in bytes is
+		 * an upper bound on the byte length of any fetched substring (and we
+		 * know that len+1 is safe to allocate because the varlena header is
+		 * longer than 1 byte).
+		 */
+		if (maxsiz > orig_len)
+			conv_bufsiz = orig_len + 1;
+		else
+			conv_bufsiz = maxsiz + 1;	/* safe since maxsiz < 2^30 */
+
+		matchctx->conv_buf = palloc(conv_bufsiz);
+		matchctx->conv_bufsiz = conv_bufsiz;
+		matchctx->wide_str = wide_str;
+	}
+	else
+	{
+		/* No need to keep the wide string if we're in a single-byte charset. */
+		pfree(wide_str);
+		matchctx->wide_str = NULL;
+		matchctx->conv_buf = NULL;
+		matchctx->conv_bufsiz = 0;
+	}
+
+	/* Clean up temp storage */
+	pfree(pmatch);
+
+	return matchctx;
+}
+
+/*
+ * build_test_info_result - build output array describing compiled regexp
+ *
+ * This borrows some code from Tcl's TclRegAbout().
+ */
+static ArrayType *
+build_test_info_result(regex_t *cpattern, test_re_flags *flags)
+{
+	/* Translation data for flag bits in regex_t.re_info */
+	struct infoname
+	{
+		int			bit;
+		const char *text;
+	};
+	static const struct infoname infonames[] = {
+		{REG_UBACKREF, "REG_UBACKREF"},
+		{REG_ULOOKAROUND, "REG_ULOOKAROUND"},
+		{REG_UBOUNDS, "REG_UBOUNDS"},
+		{REG_UBRACES, "REG_UBRACES"},
+		{REG_UBSALNUM, "REG_UBSALNUM"},
+		{REG_UPBOTCH, "REG_UPBOTCH"},
+		{REG_UBBS, "REG_UBBS"},
+		{REG_UNONPOSIX, "REG_UNONPOSIX"},
+		{REG_UUNSPEC, "REG_UUNSPEC"},
+		{REG_UUNPORT, "REG_UUNPORT"},
+		{REG_ULOCALE, "REG_ULOCALE"},
+		{REG_UEMPTYMATCH, "REG_UEMPTYMATCH"},
+		{REG_UIMPOSSIBLE, "REG_UIMPOSSIBLE"},
+		{REG_USHORTEST, "REG_USHORTEST"},
+		{0, NULL}
+	};
+	const struct infoname *inf;
+	Datum		elems[lengthof(infonames) + 1];
+	int			nresults = 0;
+	char		buf[80];
+	int			dims[1];
+	int			lbs[1];
+
+	/* Set up results: first, the number of subexpressions */
+	snprintf(buf, sizeof(buf), "%d", (int) cpattern->re_nsub);
+	elems[nresults++] = PointerGetDatum(cstring_to_text(buf));
+
+	/* Report individual info bit states */
+	for (inf = infonames; inf->bit != 0; inf++)
+	{
+		if (cpattern->re_info & inf->bit)
+		{
+			if (flags->info & inf->bit)
+				elems[nresults++] = PointerGetDatum(cstring_to_text(inf->text));
+			else
+			{
+				snprintf(buf, sizeof(buf), "unexpected %s!", inf->text);
+				elems[nresults++] = PointerGetDatum(cstring_to_text(buf));
+			}
+		}
+		else
+		{
+			if (flags->info & inf->bit)
+			{
+				snprintf(buf, sizeof(buf), "missing %s!", inf->text);
+				elems[nresults++] = PointerGetDatum(cstring_to_text(buf));
+			}
+		}
+	}
+
+	/* And form an array */
+	dims[0] = nresults;
+	lbs[0] = 1;
+	/* XXX: this hardcodes assumptions about the text type */
+	return construct_md_array(elems, NULL, 1, dims, lbs,
+							  TEXTOID, -1, false, TYPALIGN_INT);
+}
+
+/*
+ * build_test_match_result - build output array for current match
+ *
+ * Note that if the indices flag is set, we don't need any strings,
+ * just the location data.
+ */
+static ArrayType *
+build_test_match_result(test_regex_ctx *matchctx)
+{
+	char	   *buf = matchctx->conv_buf;
+	Datum	   *elems = matchctx->elems;
+	bool	   *nulls = matchctx->nulls;
+	bool		indices = matchctx->re_flags.indices;
+	char		bufstr[80];
+	int			dims[1];
+	int			lbs[1];
+	int			loc;
+	int			i;
+
+	/* Extract matching substrings from the original string */
+	loc = matchctx->next_match * matchctx->npatterns * 2;
+	for (i = 0; i < matchctx->npatterns; i++)
+	{
+		int			so = matchctx->match_locs[loc++];
+		int			eo = matchctx->match_locs[loc++];
+
+		if (indices)
+		{
+			/* Report eo this way for consistency with Tcl */
+			snprintf(bufstr, sizeof(bufstr), "%d %d",
+					 so, so < 0 ? eo : eo - 1);
+			elems[i] = PointerGetDatum(cstring_to_text(bufstr));
+			nulls[i] = false;
+		}
+		else if (so < 0 || eo < 0)
+		{
+			elems[i] = (Datum) 0;
+			nulls[i] = true;
+		}
+		else if (buf)
+		{
+			int			len = pg_wchar2mb_with_len(matchctx->wide_str + so,
+												   buf,
+												   eo - so);
+
+			Assert(len < matchctx->conv_bufsiz);
+			elems[i] = PointerGetDatum(cstring_to_text_with_len(buf, len));
+			nulls[i] = false;
+		}
+		else
+		{
+			elems[i] = DirectFunctionCall3(text_substr,
+										   PointerGetDatum(matchctx->orig_str),
+										   Int32GetDatum(so + 1),
+										   Int32GetDatum(eo - so));
+			nulls[i] = false;
+		}
+	}
+
+	/* In EXPECT indices mode, also report the "details" */
+	if (indices && (matchctx->re_flags.cflags & REG_EXPECT))
+	{
+		int			so = matchctx->details.rm_extend.rm_so;
+		int			eo = matchctx->details.rm_extend.rm_eo;
+
+		snprintf(bufstr, sizeof(bufstr), "%d %d",
+				 so, so < 0 ? eo : eo - 1);
+		elems[i] = PointerGetDatum(cstring_to_text(bufstr));
+		nulls[i] = false;
+		i++;
+	}
+
+	/* And form an array */
+	dims[0] = i;
+	lbs[0] = 1;
+	/* XXX: this hardcodes assumptions about the text type */
+	return construct_md_array(elems, nulls, 1, dims, lbs,
+							  TEXTOID, -1, false, TYPALIGN_INT);
+}
diff --git a/src/test/modules/test_regex/test_regex.control b/src/test/modules/test_regex/test_regex.control
new file mode 100644
index 0000000000..bfce1009cc
--- /dev/null
+++ b/src/test/modules/test_regex/test_regex.control
@@ -0,0 +1,4 @@
+comment = 'Test code for backend/regex/'
+default_version = '1.0'
+module_pathname = '$libdir/test_regex'
+relocatable = true