BUG #3487: regular exp
The following bug has been logged online:
Bug reference: 3487
Logged by: Mikhail
Email address: Tuchkov.Michail@gmail.com
PostgreSQL version: 8.1
Operating system: windows 2003 SP2
Description: regular exp
Details:
Please, help me!
My code:
"IF char_length(substring(str from '^[a-zA-Z]*://'))=0 THEN
str:= 'http://'||str;
END IF;"
If str= http://www.msn.com then nothing happen
(all is OK), but if str= just www.msn.com then nothing happen too!
Why?
Then I experimen with that:
I change '=' to '<>'
results:
str=http://www.msn.com -> http://http://www.msn.com
str=www.msn.com -> http://www.msn.com
Thank you.
On Thu, Jul 26, 2007 at 05:53:54AM +0000, Mikhail wrote:
The following bug has been logged online:
Bug reference: 3487
Logged by: Mikhail
Email address: Tuchkov.Michail@gmail.com
PostgreSQL version: 8.1
Operating system: windows 2003 SP2
Description: regular exp
Details:Please, help me!
My code:
"IF char_length(substring(str from '^[a-zA-Z]*://'))=0 THEN
str:= 'http://'||str;
END IF;"If str= http://www.msn.com then nothing happen
(all is OK), but if str= just www.msn.com then nothing happen too!Why?
Because substring() returns NULL when there is no match, not the empty
string. So you need
IF substring(str from '^[a-zA-Z]*://') IS NULL THEN
...
//Magnus