[Bug regex/25322] regex mishandles back-references inside interval expressions

[ahmedsayeed1982 at yahoo dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=25322

Ahmed Sayeed <ahmedsayeed1982 at yahoo dot com> changed:

           What    |Removed                     |Added
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                 CC|                            |ahmedsayeed1982 at yahoo dot 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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