Ahmed Sayeed <ahmedsayeed1...@yahoo.com> added the comment:

The glibc regular expression code mishandles regular expressions such as:

   .*((.)\2){2}$ https://www.webb-dev.co.uk/services/navona-trains/

as it does not backtrack enough to find a match that satisfies the 
back-references when they are used twice.
http://www.compilatori.com/computers/latest-car-deals/
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.acpirateradio.co.uk/computers/latest-car-deals/
This bug was originally reported against GNU 'grep' here:
The glibc regular expression code mishandles regular expressions such as:

   .*((.)\2){2}$ http://www.logoarts.co.uk/computers/latest-car-deals/

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.slipstone.co.uk/computers/latest-car-deals/

This bug was originally reported against GNU 'grep' here:
The glibc regular expression code mishandles regular expressions such as: 
http://embermanchester.uk/computers/latest-car-deals/

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

as it does not backtrack enough to find a match that satisfies the 
back-references when they are used twice. 
http://connstr.net/computers/latest-car-deals/

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://joerg.li/computers/latest-car-deals/

This bug was originally reported against GNU 'grep' here:
The glibc regular expression code mishandles regular expressions such as:

   .*((.)\2){2}$ http://www.jopspeech.com/computers/latest-car-deals/

as it does not backtrack enough to find a match that satisfies the 
back-references when they are used twice.
 http://www.wearelondonmade.com/computers/latest-car-deals/
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.
 https://waytowhatsnext.com/crypto/crypto-world/
This bug was originally reported against GNU 'grep' here:
The glibc regular expression code mishandles regular expressions such as:
http://www.iu-bloomington.com/crypto/latest-coins/
   .*((.)\2){2}$

as it does not backtrack enough to find a match that satisfies the 
back-references when they are used twice. 
https://komiya-dental.com/crypto/alt-coins/

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-look-4.com/computers/latest-car-deals/

This bug was originally reported against GNU 'grep' here:

----------
components: +email -Library (Lib), XML
nosy: +ahmedsayeed1982, barry, r.david.murray -Arfrever, dmalcolm, 
ezio.melotti, flox, iankko, loewis, neologix, orsenthil, pitrou, python-dev, 
rosslagerwall, schmir
versions:  -Python 2.6, Python 2.7, Python 3.2, Python 3.3

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue14001>
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