http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47724
--- Comment #6 from Jonathan Wakely <redi at gcc dot gnu.org> 2011-02-17 01:55:05 UTC --- I've checked in a change which prevents the crash, but only by treating line anchors as non-metacharacters. Unfortunately our regex implementation is incomplete, but this is better than crashing
