regexp(5) - phpMan

Mail::SpamAssassin::Plugin::MIMEHeader (3pm) - perform regexp tests against M...
Mail::SpamAssassin::Plugin::Rule2XSBody (3pm) - speed up SpamAssassin by comp...
regexp_table (5)     - format of Postfix regular expression tables
Tie::Hash::NamedCapture (3pm) - Named regexp capture buffers