pcre: PCRE 3.4 pcre: pcre: The PCRE library is a set of functions that implement regular expression pattern pcre: matching using the same syntax and semantics as Perl 5, with just a few differences. pcre: The current implementation corresponds to Perl 5.005. PCRE is used by many programs pcre: including Postfix and PHP. pcre: pcre: pcre: pcre: pcre: