Re: postgresql regular expr bug?

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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