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From: "noithatduyanh.1990 at gmail dot com"
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To: glibc-bugs-regex@sourceware.org
Subject: [Bug regex/25322] regex mishandles back-references inside interval
 expressions
Date: Wed, 28 Jul 2021 07:24:55 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D25322

Linda <noithatduyanh.1990 at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |noithatduyanh.1990 at gmai=
l dot co
                   |                            |m

--- Comment #21 from Linda <noithatduyanh.1990 at gmail dot com> ---
The glibc regular expression code mishandles regular expressions such as:

   .*((.)\2){2}$

as it does not backtrack enough to find a match that satisfies the
back-references when they are used twice.

To reproduce the problem, compile and run the attached file backrefbug.c. It
will exit with status 2, whereas the correct exit status is 0.
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