Re: Regular expression in an if-statement will not work

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(dot)ungermann(at)ib-ungermann(dot)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