The PCRE library is a set of functions that implement regular expression pattern matching using the same syntax and semantics as Perl 5. PCRE has its own native API, as well as a set of wrapper functions that correspond to the POSIX regular expression API. The PCRE library is free, even for building commercial software.
pcre-3.9: description + notes
The PCRE home page has more information.
Developers intending to use this distribution for application development should be sure to read the information in FAQ 3.8.
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