Need a help in regexp

---------- Forwarded message ----------
From: Nicholas I <nicholas.domnic.i@gmail.com>
Date: Thu, May 6, 2010 at 8:18 PM
Subject: Need a help in regexp
To: pgsql-sql@postgresql.org

Hi,

Need a help in regexp!

I have a table in which the data's are entered like,

Example:

One (1)
Two (2)
Three (3)

I want to extract the data which is only within the parentheses.

that is
1
2
3

i have written a query,
*select regexp_matches(name,'([^(]+)([)]+)','g') from table;*
which outputs the data as,
{"test"}
{"test2"}

Thank You
Nicholas I

In response to Nicholas I :

Hi,

Need a help in regexp!

I have a table in which the data's are entered like,

Example:

One (1)
Two (2)
Three (3)

I want to extract the data which is only within the parentheses.

that is
1
2
3

i have written a query,
select regexp_matches(name,'([^(]+)([)]+)','g') from table;
which outputs the data as,
{"test"}
{"test2"}

Thank You
Nicholas I

test=*# select * from regex ;
t
-----------
one (1)
two (2)
three (3)
(3 Zeilen)

Zeit: 0,262 ms

test=*# select regexp_replace(t, '[^0-9]','','g') from regex;
regexp_replace
----------------
1
2
3
(3 Zeilen)

Regards, Andreas
--
Andreas Kretschmer
Kontakt: Heynitz: 035242/47150, D1: 0160/7141639 (mehr: -> Header)
GnuPG: 0x31720C99, 1006 CCB4 A326 1D42 6431 2EB0 389D 1DC2 3172 0C99

On Thursday 6. May 2010 16.48.26 Nicholas I wrote:

Hi,

Need a help in regexp!

I have a table in which the data's are entered like,

Example:

One (1)
Two (2)
Three (3)

I want to extract the data which is only within the parentheses.

that is
1
2
3

i have written a query,
*select regexp_matches(name,'([^(]+)([)]+)','g') from table;*
which outputs the data as,
{"test"}
{"test2"}

If what you've got inside the parentheses always is an integer, and it's
always the only or first integer in the string, you can use:

SELECT (REGEXP_MATCHES(bar, E'(\\d+)'))[1] FROM foo;

You can even cast it to an integer on the fly:

SELECT (REGEXP_MATCHES(bar, E'(\\d+)'))[1]::INTEGER FROM foo;

Or as a more general case, whatever's inside (the first) set of parentheses:

SELECT (REGEXP_MATCHES(bar, E'\\((.+?)\\)'))[1] FROM foo;

regards,
--
Leif Biberg Kristensen
http://solumslekt.org/blog/