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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: https://metacpan.org/release/POSIX-Regex
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