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PCRE_TABLE(5) | File Formats Manual | PCRE_TABLE(5) |
NAME¶
pcre_table - format of Postfix PCRE tablesSYNOPSIS¶
postmap -q "string" pcre:/etc/postfix/filename postmap -q - pcre:/etc/postfix/filename <inputfile
DESCRIPTION¶
The Postfix mail system uses optional tables for address rewriting, mail routing, or access control. These tables are usually in dbm or db format.
COMPATIBILITY¶
With Postfix version 2.2 and earlier specify " postmap -fq" to query a table that contains case sensitive patterns. Patterns are case insensitive by default.
TABLE FORMAT¶
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 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 that same input string also
matches pattern. The if..endif can nest.
- if !/pattern/flags
- endif
- Match the input string against the patterns between
if and endif, if and only if that same 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 logical line.
- 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 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.
- 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 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.
- 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 followed 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 expansion.
SEARCH ORDER¶
Patterns are applied in the order as specified in the table, until a pattern is found that matches the input string.
TEXT SUBSTITUTION¶
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.
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¶
Use " postconf readme_directory" or " postconf html_directory" to locate this information.
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