Manual Pages for UNIX Darwin command on man pcre

Manual Pages for UNIX Darwin command on man pcre_table

PCRETABLE(5) PCRETABLE(5)

NAME

pcretable - format of Postfix PCRE tables

SYNOPSIS

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

ppoossttmmaapp -ffqq - ppccrree:://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 Perl Compatible Regu-

lar Expression form. In this case, each input is compared against a list of patterns, 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 PCRE 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 the input string also matches pattern. 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 the input string does nnoott match pattern. 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 perl-like regular expression. The expression delim-

iter 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. mm (default: off) Toggles the PCREMULTILINE 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 subject string. ss (default: on) Toggles the PCREDOTALL flag. When this flag is on, the ..

metacharacter matches the newline character. With Postfix ver-

sions prior to 20020528, The flag is off by default, which is

inconvenient for multi-line message header matching.

xx (default: off) Toggles the pcre extended flag. When this flag is on, whitespace in the pattern (other than in a character class) and characters

between a ## outside a character class and the next newline char-

acter are ignored. An escaping backslash can be used to include

a whitespace or ## character as part of the pattern.

AA (default: off)

Toggles the PCREANCHORED flag. When this flag is on, the pat-

tern 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. EE (default: off)

Toggles the PCREDOLLARENDONLY flag. When this flag is on, a $$

metacharacter in the pattern matches only at the end of the sub-

ject string. Without this flag, a dollar also matches immedi-

ately before the final character if it is a newline character (but not before any other newline characters). This flag is ignored if PCREMULTILINE flag is set. UU (default: off) Toggles the ungreedy matching flag. When this flag is on, the

pattern matching engine inverts the "greediness" of the quanti-

fiers 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. XX (default: off)

Toggles the PCREEXTRA flag. When this flag is on, any back-

slash in a pattern that is followed by a letter that has no spe-

cial meaning causes an error, thus reserving these combinations for future expansion. 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 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. 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

# 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. EEXXAAMMPPLLEE HHEEAADDEERR FFIILLTTEERR MMAAPP /^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.

# Requires PCRE version 3.

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

# Put your own body patterns here.