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+#++
+# NAME
+# pcre_table 5
+# SUMMARY
+# format of Postfix PCRE tables
+# SYNOPSIS
+# \fBpostmap -q "\fIstring\fB" pcre:/etc/postfix/\fIfilename\fR
+#
+# \fBpostmap -q - pcre:/etc/postfix/\fIfilename\fB <\fIinputfile\fR
+#
+# \fBpostmap -hmq - pcre:/etc/postfix/\fIfilename\fB <\fIinputfile\fR
+#
+# \fBpostmap -bmq - pcre:/etc/postfix/\fIfilename\fB <\fIinputfile\fR
+# DESCRIPTION
+# The Postfix mail system uses optional tables for address
+# rewriting, mail routing, or access control. These tables
+# are usually in \fBdbm\fR or \fBdb\fR format.
+#
+# Alternatively, lookup tables can be specified in Perl Compatible
+# Regular Expression form. In this case, each input is compared
+# against a list of patterns. When a match is found, the
+# corresponding result is returned and the search is terminated.
+#
+# To find out what types of lookup tables your Postfix system
+# supports use the "\fBpostconf -m\fR" command.
+#
+# To test lookup tables, use the "\fBpostmap -q\fR" command
+# as described in the SYNOPSIS above. Use "\fBpostmap -hmq
+# -\fR <\fIfile\fR" for header_checks(5) patterns, and
+# "\fBpostmap -bmq -\fR <\fIfile\fR" for body_checks(5)
+# (Postfix 2.6 and later).
+# COMPATIBILITY
+# .ad
+# .fi
+# With Postfix version 2.2 and earlier specify "\fBpostmap
+# -fq\fR" to query a table that contains case sensitive
+# patterns. Patterns are case insensitive by default.
+# TABLE FORMAT
+# .ad
+# .fi
+# The general form of a PCRE table is:
+# .IP "\fB/\fIpattern\fB/\fIflags result\fR"
+# When \fIpattern\fR matches the input string, use
+# the corresponding \fIresult\fR value.
+# .IP "\fB!/\fIpattern\fB/\fIflags result\fR"
+# When \fIpattern\fR does \fBnot\fR match the input string, use
+# the corresponding \fIresult\fR value.
+# .IP "\fBif /\fIpattern\fB/\fIflags\fR"
+# .IP "\fBendif\fR"
+# If the input string matches /\fIpattern\fR/, then match that
+# input string against the patterns between \fBif\fR and
+# \fBendif\fR. The \fBif\fR..\fBendif\fR can nest.
+# .sp
+# Note: do not prepend whitespace to patterns inside
+# \fBif\fR..\fBendif\fR.
+# .sp
+# This feature is available in Postfix 2.1 and later.
+# .IP "\fBif !/\fIpattern\fB/\fIflags\fR"
+# .IP "\fBendif\fR"
+# If the input string does not match /\fIpattern\fR/, then
+# match that input string against the patterns between \fBif\fR
+# and \fBendif\fR. The \fBif\fR..\fBendif\fR can nest.
+# .sp
+# Note: do not prepend whitespace to patterns inside
+# \fBif\fR..\fBendif\fR.
+# .sp
+# This feature is available in Postfix 2.1 and later.
+# .IP "blank lines and comments"
+# Empty lines and whitespace-only lines are ignored, as
+# are lines whose first non-whitespace character is a `#'.
+# .IP "multi-line text"
+# A logical line starts with non-whitespace text. A line that
+# starts with whitespace continues a logical line.
+# .PP
+# Each pattern is a perl-like regular expression. The expression
+# delimiter can be any non-alphanumerical 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, and newlines are not
+# treated as special characters. The behavior is controlled by flags,
+# which are toggled by appending one or more of the following
+# characters after the pattern:
+# .IP "\fBi\fR (default: on)"
+# Toggles the case sensitivity flag. By default, matching is case
+# insensitive.
+# .IP "\fBm\fR (default: off)"
+# Toggles the PCRE_MULTILINE flag. When this flag is on, the \fB^\fR
+# and \fB$\fR metacharacters match immediately after and immediately
+# before a newline character, respectively, in addition to
+# matching at the start and end of the subject string.
+# .IP "\fBs\fR (default: on)"
+# Toggles the PCRE_DOTALL flag. When this flag is on, the \fB.\fR
+# metacharacter matches the newline character. With
+# Postfix versions prior to 2.0, the flag is off by
+# default, which is inconvenient for multi-line message header
+# matching.
+# .IP "\fBx\fR (default: off)"
+# Toggles the pcre extended flag. When this flag is on, whitespace
+# characters in the pattern (other than in a character class)
+# are ignored. To include a whitespace character as part of
+# the pattern, escape it with backslash.
+# .sp
+# Note: do not use \fB#\fIcomment\fR after patterns.
+# .IP "\fBA\fR (default: off)"
+# Toggles the PCRE_ANCHORED flag. When this flag is on,
+# the pattern is forced to be "anchored", that is, it is
+# constrained to match only at the start of the string which
+# is being searched (the "subject string"). This effect can
+# also be achieved by appropriate constructs in the pattern
+# itself.
+# .IP "\fBE\fR (default: off)"
+# Toggles the PCRE_DOLLAR_ENDONLY flag. When this flag is on,
+# a \fB$\fR metacharacter in the pattern matches only at the
+# end of the subject string. Without this flag, a dollar also
+# matches immediately before the final character if it is a
+# newline character (but not before any other newline
+# characters). This flag is ignored if PCRE_MULTILINE
+# flag is set.
+# .IP "\fBU\fR (default: off)"
+# Toggles the ungreedy matching flag. When this flag is on,
+# the pattern matching engine inverts the "greediness" of
+# the quantifiers so that they are not greedy by default,
+# but become greedy if followed by "?". This flag can also
+# set by a (?U) modifier within the pattern.
+# .IP "\fBX\fR (default: off)"
+# Toggles the PCRE_EXTRA flag.
+# When this flag is on, any backslash in a pattern that is
+# followed by a letter that has no special meaning causes an
+# error, thus reserving these combinations for future expansion.
+# SEARCH ORDER
+# .ad
+# .fi
+# Patterns are applied in the order as specified in the table, until a
+# pattern is found that matches the input string.
+#
+# Each pattern is applied to the entire input 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.
+# TEXT SUBSTITUTION
+# .ad
+# .fi
+# Substitution of substrings (text that matches patterns
+# inside "()") from the matched expression into the result
+# string is requested with $1, $2, etc.; specify $$ to produce
+# a $ character as output.
+# The macros in the result string may need to be written as
+# ${n} or $(n) if they aren't followed by whitespace.
+#
+# Note: since negated patterns (those preceded by \fB!\fR) return a
+# result when the expression does not match, substitutions are not
+# available for negated patterns.
+# EXAMPLE SMTPD ACCESS MAP
+# # 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 $1
+#
+# # A multi-line entry. The text is sent as one line.
+# #
+# /^noddy@my\\.domain$/
+# \ 550 This user is a funny one. You really don't want to send mail to
+# \ them as it only makes their head spin.
+# EXAMPLE HEADER FILTER MAP
+# /^Subject: make money fast/ REJECT
+# /^To: friend@public\\.com/ REJECT
+# EXAMPLE BODY FILTER MAP
+# # First skip over base 64 encoded text to save CPU cycles.
+# # Requires PCRE version 3.
+# ~^[[:alnum:]+/]{60,}$~ OK
+#
+# # Put your own body patterns here.
+# SEE ALSO
+# postmap(1), Postfix lookup table manager
+# postconf(5), configuration parameters
+# regexp_table(5), format of POSIX regular expression tables
+# README FILES
+# .ad
+# .fi
+# Use "\fBpostconf readme_directory\fR" or
+# "\fBpostconf html_directory\fR" to locate this information.
+# .na
+# .nf
+# DATABASE_README, Postfix lookup table overview
+# 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
+#
+# Wietse Venema
+# Google, Inc.
+# 111 8th Avenue
+# New York, NY 10011, USA
+#--