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From: "ahmedsayeed1982 at yahoo dot com" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs-regex@sourceware.org
Subject: [Bug regex/25322] regex mishandles back-references inside interval
 expressions
Date: Tue, 25 May 2021 19:52:12 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D25322

Ahmed Sayeed <ahmedsayeed1982 at yahoo dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |ahmedsayeed1982 at yahoo d=
ot com

--- Comment #1 from Ahmed Sayeed <ahmedsayeed1982 at yahoo 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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