#++
# 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).
#
#       This driver can be built with the pcre2 library (Postfix
#       3.7 and later), or with the legacy pcre library (all Postfix
#       versions).
# 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-alphanumeric 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 the pcre MULTILINE
#       flag is set.
# .IP "\fBU\fR (default: off)"
#       Toggles the pcre UNGREEDY 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.
#
#       This feature is not supported with PCRE2.
# 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 $(n) if they aren't followed by whitespace.
#       This feature does not support pcre2 substring names.
#
#       Note: since negated patterns (those preceded by \fB!\fR) return a
#       result when the expression does not match, substitutions are not
#       available for negated patterns.
# INLINE SPECIFICATION
# .ad
# .fi
#       The contents of a table may be specified in the table name
#       (Postfix 3.7 and later).
#       The basic syntax is:
#
# .nf
#       main.cf:
#           \fIparameter\fR \fB= .. pcre:{ { \fIrule-1\fB }, { \fIrule-2\fB } .. } ..\fR
#
#       master.cf:
#           \fB.. -o { \fIparameter\fR \fB= .. pcre:{ { \fIrule-1\fB }, { \fIrule-2\fB } .. } .. } ..\fR
# .fi
#
#       Postfix recursively expands any \fI$parametername\fR instances
#       in the above parameter value, ignores whitespace after '{'
#       and before '}', and writes each \fIrule\fR as one text line to
#       an in-memory file:
#
# .nf
#       in-memory file:
#           rule-1
#           rule-2
#           ..
# .fi
#
#       Postfix parses the result as if it is a file in /etc/postfix.
# INLINE SPECIFICATION CAVEATS
# .ad
# .fi
# .IP \(bu
#       When using \fI$parametername\fR inside an inlined pattern,
#       use \eQ\fI$parametername\fR\eE to disable metacharacters such as
#       '.' in the \fI$parametername\fR expansion. Otherwise, the pattern
#       may have unexpected matches.
# .IP \(bu
#       When an inlined rule must contain \fB$\fR, specify \fB$$\fR
#       to keep Postfix from trying to do \fI$name\fR expansion as
#       it evaluates a parameter value. To check an inline configuration,
#       use the "\fBpostconf -x\fR" option as shown below:
# .RS
# .IP \(bu
#       When a main.cf "\fIparametername = \fI value\fR" setting contains
#       an inline pcre: table, use the command "\fBpostconf -x
#       \fIparametername\fR". Verify that there are no "undefined
#       parameter" warnings, and that the output has the syntax that
#       one would use in a non-inlined Postfix pcre: file.
# .IP \(bu
#       When a master.cf "\fB-o { \fIparametername = value\fB }\fR"
#       override contains an inline pcre: table, use the command
#       "\fBpostconf -Px '*/*/\fIparametername\fB' \fR". Verify that there
#       are no "undefined parameter" warnings, and that the output has
#       the syntax that one would use in a non-inlined Postfix pcre: file.
# .RE
# 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
#       [email protected]
#       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
#--

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