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Postfix Documentation
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Postfix PCRE Support

PCRE (Perl Compatible Regular Expressions) map support

The optional "pcre" map type allows you to specify regular expressions with the PERL style notation such as \s for space and \S for non-space. The main benefit, however, is that pcre lookups are often faster than regexp lookups. This is because the pcre implementation is often more efficient than the POSIX regular expression implementation that you find on many systems.

A description of how to use pcre tables, including examples, is given in the pcre_table(5) manual page. Information about PCRE itself can be found at

Postfix Documentation
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