sinatra/sinatra — pull request #898 by jeremyevans (2014-07-03 20:52:31+00:00)
Title: Correctly handle encoded colons in routes (Fixes #776)

This uses a negative lookahead assertion to ensure the colon is
not followed by a character that will make it a key. In that
case, it should be treated as a literal colon, and handled similar
to other literal special characters.