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List: pgsql-bugs
Subject: Re: [BUGS] BUG #3487: regular exp
From: Magnus Hagander <magnus () hagander ! net>
Date: 2007-07-26 7:53:09
Message-ID: 20070726075309.GA22213 () svr2 ! hagander ! net
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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
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