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

["kimolsun2020 at outlook dot com" <sourceware-bugzilla@sourceware.org>]

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

Kuka Kim <kimolsun2020 at outlook dot com> changed:

           What    |Removed                     |Added
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                 CC|                            |kimolsun2020 at outlook dot com

--- Comment #75 from Kuka Kim <kimolsun2020 at outlook dot com> ---
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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.

This bug was originally reported against GNU 'g 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.

This bug was originally reported against GNU 'g 
http://fishingnewsletters.co.uk/
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.


http://www.go-mk-websites.co.uk/
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.

http://www.mconstantine.co.uk/
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.

http://the-hunters.org/  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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