Forums Scripts & Popups verifying data matches and returning the result???

I'm going to have to do some more research, unless someone else can do this first, but I've got a feeling that a regex statement would be best for this. My knowledge of regex is limited, so I want to verify before giving you a code, but I won't be doing that until later (as it's 3:30 am).

BTW: I hope you had a nice vacation, and it's good to see you back.