Ok, so there's a website for playing "Regex golf" here: http://regex.alf.nu/
Basically, you get given some things to match and some things to not match and you have to write a single regular expression (in as few chars as possible) to do it.
Hopefully we'll see some of other top guys in the Regular Expressions Topic Area too... @ozo, @kaufmed, @DanCraciun, @ddrudik
Let me know your score :-)
This is really more like a lounge question so I've kept points to 50...