ohboyohboyohboy/antlr3 — pull request #24 by dwarring (2013-03-22 20:27:21+00:00)
Title: Fixed URL rule

That's my reading of the CSS2.1 spec. See also http://stackoverflow.com/questions/6006944/having-trouble-grokking-css-2-1-grammar/14907962#14907962