Manual Pages for UNIX Darwin command on man regexp

Manual Pages for UNIX Darwin command on man regexp_table

REGEXPTABLE(5) REGEXPTABLE(5)

NAME

regexptable - format of Postfix regular expression tables

SYNOPSIS

ppoossttmmaapp -ffqq ""string"" rreeggeexxpp:://eettcc//ppoossttffiixx//filename

ppoossttmmaapp -ffqq - rreeggeexxpp:://eettcc//ppoossttffiixx//filename

DESCRIPTION

The Postfix mail system uses optional tables for address rewriting or mail routing. These tables are usually in ddbbmm or ddbb format.

Alternatively, lookup tables can be specified in POSIX regular expres-

sion form. In this case, each input is compared against a list of pat-

terns, and when a match is found the corresponding result is returned. To find out what types of lookup tables your Postfix system supports

use the ppoossttccoonnff -mm command.

To test lookup tables, use the ppoossttmmaapp -ffqq command as described in the

SYNOPSIS above.

TTAABBLLEE FFOORRMMAATT The general form of a Postfix regular expression table is: //pattern//flags result When pattern matches the input string, use the corresponding result value. !!//pattern//flags result

When pattern does nnoott match the input string, use the corre-

sponding result value. iiff //pattern//flags eennddiiff Match the input string against the patterns between iiff and

eennddiiff, if and only if that same input string also matches pat-

tern. The iiff..eennddiiff can nest. Note: do not prepend whitespace to patterns inside iiff..eennddiiff. iiff !!//pattern//flags eennddiiff Match the input string against the patterns between iiff and

eennddiiff, if and only if that same input string does nnoott match pat-

tern. The iiff..eennddiiff can nest. 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 POSIX regular expression enclosed by a pair of delim-

iters. The regular expression syntax is documented in reformat(7) with 4.4BSD, in regex(5) with Solaris, and in regex(7) with Linux. Other systems may use other document names. 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, 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: ii (default: on) Toggles the case sensitivity flag. By default, matching is case insensitive. xx (default: on) Toggles the extended expression syntax flag. By default, support for extended expression syntax is enabled. mm (default: off)

Toggle the multi-line mode flag. When this flag is on, the ^^ and

$$ metacharacters match immediately after and immediately before

a newline character, respectively, in addition to matching at the start and end of the input string. TTAABBLLEE SSEEAARRCCHH OORRDDEERR 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 par-

ent network search is done, and user@domain mail addresses are not bro-

ken up into their user and domain constituent parts, nor is user+foo broken up into user and foo. TTEEXXTT SSUUBBSSTTIITTUUTTIIOONN 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. Note: since negated patterns (those preceded by !!) return a result when the expression does not match, substitutions are not available for negated patterns. EEXXAAMMPPLLEE SSMMTTPPDD AACCCCEESSSS MMAAPP

# 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

if !/^owner-/

/^(.*)-outgoing@(.*)$/ 550 Use ${1}@${2} instead

endif EEXXAAMMPPLLEE HHEEAADDEERR FFIILLTTEERR MMAAPP

# These were once common in junk mail.

/^Subject: make money fast/ REJECT /^To: friend@public\.com/ REJECT EEXXAAMMPPLLEE BBOODDYY FFIILLTTEERR MMAAPP

# First skip over base 64 encoded text to save CPU cycles.

~^[[:alnum:]+/]{60,}$~ OK

# Put your own body patterns here.