[Videx]

The question is good, but you need at least one more answer - "twelve". Maybe more if your users speak more languages. You never told us anything about your site, but if you can get away with a more specific question you may block more actual humans. e.g. "In what year was the Mustang introduced?" would work fine on an antique car forum.

I wouldn't worry about the regex. I see the Help file doesn't explain it. Perhaps it's just there for future use when the bots get better at answering simple questions (and they will). I've seen some stuff over at vb.com about it if you're really interested enough to look it up, and there may be something in the manual.