| Lists: | pgsql-bugs |
|---|
| From: | "Mikhail" <Tuchkov(dot)Michail(at)gmail(dot)com> |
|---|---|
| To: | pgsql-bugs(at)postgresql(dot)org |
| Subject: | BUG #3487: regular exp |
| Date: | 2007-07-26 05:53:54 |
| Message-ID: | 200707260553.l6Q5rsBr027947@wwwmaster.postgresql.org |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Lists: | pgsql-bugs |
The following bug has been logged online:
Bug reference: 3487
Logged by: Mikhail
Email address: Tuchkov(dot)Michail(at)gmail(dot)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.
| From: | Magnus Hagander <magnus(at)hagander(dot)net> |
|---|---|
| To: | Mikhail <Tuchkov(dot)Michail(at)gmail(dot)com> |
| Cc: | pgsql-bugs(at)postgresql(dot)org |
| Subject: | Re: BUG #3487: regular exp |
| Date: | 2007-07-26 07:53:09 |
| Message-ID: | 20070726075309.GA22213@svr2.hagander.net |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Lists: | pgsql-bugs |
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(dot)Michail(at)gmail(dot)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