I tried it once more, now. There is no change in the behavior. I use the
$$-notation to avoid double "\" and double "'". Also there is no syntax error
in this statement.
The constraint is a bad option because I have to log errors when I import a
csv-file.
Thanks and regards
Carsten Ungermann
Am 09.09.2010 um 15:44 schrieb Szymon Guz:
>
>
> On 9 September 2010 12:55, Ungermann Carsten
> <carsten.ungerm...@ib-ungermann.de> wrote:
> Dear postgres list,
>
> I need to verify the value of a column by a regular expression in an
> if-statement before insert or update. It should be a one to three digit
> value. I wrote a trigger and a trigger function. In the trigger function I
> want to use the following if-statement to verify the value:
>
> IF new.value !~ E'^\d{1,3}$' THEN
> RAISE EXCEPTION '...some text...';
> END IF;
>
> It will not work! Why?
>
>
> How about this:
>
> IF new.value !~ E'^\\d{1,3}$' THEN
>
>
> Or if you only want to check the 3digit value, without any trigger, IMHO this
> is much simpler:
>
> alter table x add constraint check_is_3_digit check ( value ~ E'^\\d{3}$' );
>
> regards
> Szymon Guz
