LinuxDig.com : Linux Dictionary Term pcre

1. PCRE has its own native API, but a set of "wrapper" functions that are based onthe 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. This package contains a grep variant based on the PCRE library. From Mandrake 9.0 RPM

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Linux Dictionary (version 0.12)
author: Binh Nguyen
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2. 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. From Redhat 8.0 RPM