Since 5.10 people can replace the regex engine of Perl by plugging in some other regex engine. ( See the perlreapi for details).
I found several implementations on CPAN:
re::engine::PCRE seems to be the first one others use as the base, then there is re::engine::RE2 which is "Rather under development", re::engine::LPEG which is declared as a failure and
re::engine::Oniguruma.
Are there other implementations?
I wonder if any of these are in use and what are the use cases? What issues do these plugs solve that is impossible, harder, slower or have some other issues with the standard regex engine of Perl?
If any of the authors read this, I wonder if you had any other motivation than just having fun with this and if you have any conclusion to draw?
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