Subject Re: [firebird-support] Enabling only numbers at field varchar(11)
Author unordained
---------- Original Message -----------
From: "Ismael L. Donis Garcia" <ismael@...>
> As I could validate that an alone field of varchar(11) enabled numbers
> and that these had 11 characters of length?
------- End of Original Message -------

I've not used FB regular expressions yet, but my first stab would be:

alter table ... add constraint ... check (value similar to '[[:DIGIT:]]{11}');