provide access to the PCRE (perl compatible-regular-expressions) library
for pattern matching. The PCRE library is a set of functions that
implement regular expression pattern matching using the same syntax and
semantics as Perl 5. This syntax can often handle more complex expressions
and capturing than standard regular expression implementations. For more
information about PCRE, please see: http://www.pcre.org/
lib_mysqludf_preg is a useful performance optimization for those
applications that are already performing these regular expression
matches in a high level language (ie. PHP) on the client side.
It is also helpful when there is a need to capture a parenthesized
subexpression from a regular expression, or simply as a slight
performance boost over the builtin RLIKE/REGEXP functions.
WWW: http://www.mysqludf.org/lib_mysqludf_preg/index.php
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