Perl-compatible regular expression library.
PCRE has its own native API, but a set of "wrapper" functions that are based on
the POSIX API are also supplied in the library libpcreposix.
Note that this just provides a POSIX calling interface to PCRE: the regular expressions themselves still follow Perl syntax and semantics.
The header file for the POSIX-style functions is called pcreposix.h.