This is a testament to the unreadability of the regular expression,
since I misunderstood it, while you understood my code snippet
above just fine. Terse != readable. But ok, doing the right thing
would take more code, and too much verbosity impacts clarity,
so keeping the regexp seems fine.

I suggest using a raw string literal to avoid escaping the backslashes.
http://golang.org/ref/spec#String_literals