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This is a port of the glibc gnu regex engine into perl.  There are few
reasons you would need this.  The few I can think of include:

0) You wish to use untrusted user expressions in such a way as to be
able to catch errors.  Example:  eval { alarm 2;  m/((){1024}){1024}/ }
is an instant uncatchable segmentation fault.  GNU's regexps will still
fail, but in a timeout way rather than an instant segfault way.

1) You wish to have POSIX compliance on ... something ...  Perl's
regexps are slightly different -- arguably better, but different.

WWW:    http://search.cpan.org/dist/POSIX-Regex/