On Tue, Feb 17, 2004 at 03:46:53 -0800,
pativo <pativo@arcor.de> wrote:
> Hello to all,
>
> I have small problem. I have some database fields (VARCHAR)
> and these field should hold some ahex coded values. So the
> string length must be even and each character can only be
> 0-9, a-f or A-F.
You can use a constraint that checks the value versus a regular
expression. Something like: ~ '^([0-9a-fA-F][0-9a-fA-F])+$^'
Unless the 150 character limit is a real business rule, you probably
want to use TEXT instead of VARCHAR(150).