NetBSD/gnu/dist/postfix/proto/pcre_table

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#++
# NAME
# pcre_table 5
# SUMMARY
# format of Postfix PCRE tables
# SYNOPSIS
# pcre:/etc/postfix/filename
# DESCRIPTION
# The Postfix mail system uses optional tables for address
# rewriting or mail routing. These tables are usually in
# \fBdbm\fR or \fBdb\fR 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 \fBpostconf -m\fR command.
#
# The general form of a PCRE table is:
# .IP "blanks and comments"
# Blank lines are ignored, as are lines beginning with `#'.
# .IP "leading whitespace"
# Lines that begin with whitespace continue the previous line.
# .IP "\fIpattern result\fR"
# When \fIpattern\fR matches a search string, use the corresponding
# \fIresult\fR. A line that starts with white space continues the
# preceding line.
# .PP
# Each pattern is a perl-like regular expression. The expression
# delimiter can be any character, except whitespace or characters
# that have special meaning (traditionally the forward 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
# \fIuser@domain\fR mail addresses are not broken up into their
# \fIuser\fR and \fIdomain\fR constituent parts, nor is \fIuser+foo\fR
# broken up into \fIuser\fR and \fIfoo\fR.
#
# 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 $(n) if they aren't followed by whitespace.
# EXAMPLES
# # Protect your outgoing majordomo exploders
# /^(?!owner-)(.*)-outgoing@(my\.domain)$/ 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 $0
#
# # A multi-line entry. The text is sent as one line.
# #
# /^noddy@connect\.com\.au$/
# \ 550 This user is a funny one. You really don't want to send mail to
# \ them as it only makes their head spin.
# SEE ALSO
# regexp_table(5) format of POSIX regular expression tables
# AUTHOR(S)
# The PCRE table lookup code was originally written by:
# Andrew McNamara
# andrewm@connect.com.au
# 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
#--