PIRE is Perl Incompatible Regular Expressions library.
This library is aimed at checking a huge amount of text against
relatively many regular expressions. Roughly speaking, it can
just check whether given text maches the certain regexp, but
can do it really fast (more than 400 MB/s on our hardware is
common). Even more, multiple regexps can be combined together,
giving capability to check the text against apx. 10 regexps in
a single pass (and mantaining the same speed).
Pire was developed in Yandex (http://company.yandex.ru/) as a
part of its web crawler.
Homepage: https://github.com/yandex/pire
Boris Nagaev