validate domain with regexp

Hi

I'm trying to create a script that validates domain names, but I can't get it to work 100%

$string = "www.domain.com"
$Check = StringRegExp($string, '([w]{3}.[0-9|a-z|æøå|-]*.[a-z|co.uk]{0,5}|[0-9|a-z|æøå|-]*.[a-z|co.uk]{0,5})', 1)

It checks both with www. and without www.

The code works except if i type "www.domain.c" then it still validates but it shouldn't but I can't find out how to fix it.

Can any of you help me

Cheers

c;") /Rex