From: | hubert depesz lubaczewski <depesz(at)depesz(dot)com> |
---|---|
To: | Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com> |
Cc: | PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: postgresql regular expr bug? |
Date: | 2009-06-14 07:25:50 |
Message-ID: | 20090614072550.GA29058@depesz.com |
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Thread: | |
Lists: | pgsql-hackers |
On Sun, Jun 14, 2009 at 08:15:55AM +0200, Pavel Stehule wrote:
> postgres=# select '10' ~ '[0..9]+$';
> ?column?
> ----------
> t
> (1 row)
regexp '[0..9]+$' tests is given strings containst at the end substring
containing only characters "0", "9" and ".".
and yes, it does - the last character is 0, so it matches.
> postgres=# select '10' ~ '^[0..9]+$';
> ?column?
> ----------
> f
> (1 row)
this regexp checks if whole string is built only with characters "0",
"9", and ".". and it is not - the first character is "1" which is not
the character list you provided.
basically ".." has no special meaning in regexps, especially within [] -
i.e. it is just a dot.
Best regards,
depesz
--
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