tree c0cfc70e28d54b948a375113604d2f528fc4172c
parent 34cd161d7b70c39957f46c9602aef165d747a466
author John MacFarlane <jgm@berkeley.edu> 1436758774 -0700
committer John MacFarlane <jgm@berkeley.edu> 1436758774 -0700

Fixed scanner for link url.

re2c returns the longest match, so we were getting bad
results with

    [link](foo\(and\(bar\)\))

which it would parse as containing a bare `\` followed by
an in-parens chunk ending with the final paren.