To: pgsql-sql@postgresql.org
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From: Jasen Betts <jasen@xnet.co.nz>
Newsgroups: gmane.comp.db.postgresql.sql
Subject: Re: question about reg. expression
Date: 22 Jan 2011 08:59:27 GMT
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On 2011-01-18, andrew1 <andrew1@mytrashmail.com> wrote:
> hi all,
>
> these return t:
> select 'ab' ~ '[a-z]$'

this matches the b and the end of the string

> select 'ab' ~ '^[a-z]'

this matches the start of the string and the a

> select 'ab' ~ '^[a-z]$' returns f

> Can't I use ^ and $ at the same time to match, in this case?
> thanks.

the above expression only succeeds if the string is one character long

use '+' '*' or '{2}' etc after the '[a-z]' to allow it to match several letters

or use '^[a-z]|[a-z]$' to match any sting that starts or ends with a
letter.

what are you trying to find?

 
-- 
⚂⚃ 100% natural