[PATCH 0 of 1 4test] only use re2 if it works

Simon Heimberg simohe at besonet.ch
Sun Jun 30 23:52:15 CDT 2013

This could fix the issue 3964 by working around the bug in old re2 (from facebook 
and from axjak). I do not have any of them installed. Could somebody test please?

The test regexp is taken from the issue. Maybe a simpler one would work as well.

Should we warn the user when he uses an old re2 version?

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