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

PCRE_TABLE(5)			       File Formats Manual			    PCRE_TABLE(5)

       pcre_table - format of Postfix PCRE 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
       Perl Compatible Regular Expression form.

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

       The general form of a PCRE 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.

       Each pattern is a perl-like regular expression. 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 supported, but the only other useful one is `U',
       which makes matching ungreedy (see PCRE documentation and source for more info).

       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 the conventional perl syntax ($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.

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

       # Bounce friend@whatever, except when whatever is our domain (you would
       # be better just bouncing all friend@ mail - this is just an example).
       /^friend@(?!my\.domain)/        550 Stick this in your pipe $0

       # A multi-line entry. The text is sent as one line.
	550 This user is a funny one. You really don't want to send mail to
	them as it only makes their head spin.

       /^Subject: make money fast/     REJECT
       /^To: friend@public\.com/       REJECT

       regexp_table(5) format of POSIX regular expression tables

       The PCRE table lookup code was originally written 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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