I'm no expert, but I would probably use something like:
[A-HJ-Z] <-- EDIT: ignore this, it's stupid, sorry. See my next post...
Or is that overly simple?
Two resources that I always find very useful:
Regular Expressions Cheat Sheet Just has some handy reminders about syntax for regular expressions.
Online RegEx Tester Tests your regular expressions, to allow you to iteratively improve them.
Dave.
[ January 08, 2008: Message edited by: David Payne ]