[Bahamut]

It was a kinda cool thing, although I got some strange behavior when I was using `match` for determining whether the input is a filename - my regex was /.\../ (and so I did var match = i.match(/.\../) ), and match[1] was undefined - turned out match[2] was what I wanted, and it was present, but the behavior was incorrect in the reporting console in the game.

I finished this in 4 minutes.

Edit: looks like HN doesn't like asterisks

[tensafefrogs]

I thought regex was overkill for that one and used:

return input.split(".")[1] || "";

[dclowd9901]

I fully anticipated a test case like file.name.ext. Of course, you could still do what you're doing, but it'd be a lot more verbose.

[Bahamut]

What if it had multiple dots? Anyhow, I am on 5 hours of sleep, and already s spent6 hours coding...I just wanted to finish fast.