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RedHat 9 (Linux i386) - man page for regexp_table (redhat section 5)

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       regexp_table - format of Postfix regular expression tables


       The  Postfix mail system uses optional tables for address rewriting or mail routing. These
       tables are usually in dbm or db format. Alternatively, lookup tables can be  specified  in
       POSIX regular expression form.

       To  find  out what types of lookup tables your Postfix system supports use the postconf -m

       The general form of a Postfix regular expression table is:

       pattern result
	      When pattern matches a search string, use the corresponding result.

       blank lines and comments
	      Empty lines and whitespace-only lines are ignored, as are lines  whose  first  non-
	      whitespace character is a `#'.

       multi-line text
	      A  logical line starts with non-whitespace text. A line that starts with whitespace
	      continues a logical line.

       pattern1!pattern2 result
	      Matches pattern1 but not pattern2.

       Each pattern is a regular expression enclosed  by  a  pair  of  delimiters.   The  regular
       expression syntax is described in re_format(7).	The expression delimiter can be any char-
       acter, except whitespace or characters that have special meaning (traditionally	the  for-
       ward slash is used). The regular expression can contain whitespace.

       By  default, matching is case-insensitive, although following the second slash with an `i'
       flag will reverse this. Other flags are `x' (disable extended expression syntax), and  `m'
       (enable multi-line mode).

       Each  pattern  is  applied to the entire lookup key string.  Depending on the application,
       that string is an entire client hostname, an entire client IP address, or an  entire  mail
       address.   Thus,  no  parent domain or parent network search is done, and user@domain mail
       addresses are not broken up into their user and domain constituent parts, nor is  user+foo
       broken up into user and foo.

       Patterns are applied in the order as specified in the table, until a pattern is found that
       matches the search string.

       Substitution of substrings from the matched expression into the result string is  possible
       using $1, $2, etc.. The macros in the result string may need to be written as ${n} or $(n)
       if they aren't followed by whitespace.

       # Disallow sender-specified routing. This is a must if you relay mail
       # for other domains.
       /[%!@].*[%!@]/	    550 Sender-specified routing rejected

       # Postmaster is OK, that way they can talk to us about how to fix
       # their problem.
       /^postmaster@/	    OK

       # Protect your outgoing majordomo exploders
       /^(.*)-outgoing@(.*)$/!/^owner-/ 	550 Use ${1}@${2} instead

       # These were once common in junk mail.
       /^Subject: make money fast/     REJECT
       /^To: friend@public\.com/       REJECT

       pcre_table(5) format of PCRE tables

       The regexp table lookup code was originally written by:
       LaMont Jones

       That code was based on the PCRE dictionary contributed by:
       Andrew McNamara
       connect.com.au Pty. Ltd.
       Level 3, 213 Miller St
       North Sydney, NSW, Australia

       Adopted and adapted by:
       Wietse Venema
       IBM T.J. Watson Research
       P.O. Box 704
       Yorktown Heights, NY 10598, USA

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