1. "pcre" stands for "Perl Compatible Regular Expressions".
You can find out more information from their web page,
http://www.pcre.org:
Quote:
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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.
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2. You will probably also find out that pcre is not a "GCC library". It is, however, a library that may be used with the Gcc compiler.