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Postfix manual - pcre_table(5)

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PCRE_TABLE(5) PCRE_TABLE(5) NAME pcre_table - format of Postfix PCRE tables SYNOPSIS postmap -fq "string" pcre:/etc/postfix/filename postmap -fq - pcre:/etc/postfix/filename <inputfile DESCRIPTION The Postfix mail system uses optional tables for address rewriting or mail routing. These tables are usually in dbm or db format. Alternatively, lookup tables can be specified in Perl Com- patible Regular 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 sys- tem supports use the "postconf -m" command. To test lookup tables, use the "postmap -fq" command as described in the SYNOPSIS above. TABLE FORMAT The general form of a PCRE table is: /pattern/flags result When pattern matches the input string, use the cor- responding result value. !/pattern/flags result When pattern does not match the input string, use the corresponding result value. if /pattern/flags endif Match the input string against the patterns between if and endif, if and only if the input string also matches pattern. The if..endif can nest. Note: do not prepend whitespace to patterns inside if..endif. if !/pattern/flags endif Match the input string against the patterns between if and endif, if and only if the input string does not match pattern. The if..endif 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 logi- cal line. Each pattern is a perl-like regular expression. The expression delimiter can be any character, except white- space or characters that have special meaning (tradition- ally 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 con- trolled by flags, which are toggled by appending one or more of the following characters after the pattern: i (default: on) Toggles the case sensitivity flag. By default, matching is case insensitive. m (default: off) Toggles the PCRE_MULTILINE 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. s (default: on) Toggles the PCRE_DOTALL flag. When this flag is on, the . 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. x (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 character are ignored. An escaping backslash can be used to include a whitespace or # character as part of the pattern. A (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. E (default: off) Toggles the PCRE_DOLLAR_ENDONLY flag. When this flag is on, a $ metacharacter in the pattern matches only at the end of the subject 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 charac- ters). This flag is ignored if PCRE_MULTILINE flag is set. U (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 fol- lowed by "?". This flag can also set by a (?U) modifier within the pattern. X (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 expan- sion. SEARCH ORDER Patterns are applied in the order as specified in the ta- ble, 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 [email protected] mail addresses are not broken up into their user and domain constituent parts, nor is user+foo broken up into user and foo. TEXT SUBSTITUTION 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. EXAMPLE SMTPD ACCESS MAP # Protect your outgoing majordomo exploders /^(?!owner-)(.*)[email protected](.*)/ 550 Use ${1}@${2} instead # Bounce [email protected], except when whatever is our domain (you would # be better just bouncing all [email protected] mail - this is just an example). /^([email protected](?!my\.domain$).*)$/ 550 Stick this in your pipe $1 # A multi-line entry. The text is sent as one line. # /^[email protected]\.domain$/ 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: [email protected]\.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 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 PCRE_TABLE(5)

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