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Exim is an MTA (mail transfer agent) that is intended to be a drop-in replacement for Sendmail. It was originally written in 1995 by Philip Hazel.

In 1997 he replaced its POSIX regular expression library written by Henry Spencer with a new library Hazel developed called PCRE[?] (Perl Compatible Regular Expressions). Perl regular expressions are much more powerful than POSIX and other common regular expressions, so PCRE has become popular in many applications other than Exim.

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