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<html> <head> </head> <body> <pre>
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PCRE_TABLE(5) PCRE_TABLE(5)
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<b>NAME</b>
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pcre_table - format of Postfix PCRE tables
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<b>SYNOPSIS</b>
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pcre:/etc/postfix/filename
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<b>DESCRIPTION</b>
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The Postfix mail system uses optional tables for address
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rewriting or mail routing. These tables are usually in <b>dbm</b>
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or <b>db</b> format. Alternatively, lookup tables can be speci-
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fied in Perl Compatible Regular Expression form.
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To find out what types of lookup tables your Postfix sys-
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tem supports use the <b>postconf</b> <b>-m</b> command.
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The general form of a PCRE table is:
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<i>pattern</i> <i>result</i>
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When <i>pattern</i> matches a search string, use the cor-
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responding <i>result</i>.
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blank lines and comments
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Empty lines and whitespace-only lines are ignored,
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as are lines whose first non-whitespace character
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is a `#'.
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multi-line text
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A logical line starts with non-whitespace text. A
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line that starts with whitespace continues a logi-
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cal line.
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Each pattern is a perl-like regular expression. The
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expression delimiter can be any character, except whites-
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pace or characters that have special meaning (tradition-
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ally the forward slash is used). The regular expression
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can contain whitespace.
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By default, matching is case-insensitive, although follow-
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ing the second slash with an `i' flag will reverse this.
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Other flags are supported, but the only other useful one
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is `U', which makes matching ungreedy (see PCRE documenta-
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tion and source for more info).
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Each pattern is applied to the entire lookup key string.
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Depending on the application, that string is an entire
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client hostname, an entire client IP address, or an entire
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mail address. Thus, no parent domain or parent network
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search is done, and <i>user@domain</i> mail addresses are not
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broken up into their <i>user</i> and <i>domain</i> constituent parts,
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nor is <i>user+foo</i> broken up into <i>user</i> and <i>foo</i>.
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Patterns are applied in the order as specified in the
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table, until a pattern is found that matches the search
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string.
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Substitution of substrings from the matched expression
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into the result string is possible using the conventional
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perl syntax ($1, $2, etc.). The macros in the result
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string may need to be written as ${n} or $(n) if they
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aren't followed by whitespace.
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<b>EXAMPLE</b> <b>SMTPD</b> <b>ACCESS</b> <b>MAP</b>
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# Protect your outgoing majordomo exploders
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/^(?!owner-)(.*)-outgoing@/ 550 Use ${1}@${2} instead
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# Bounce friend@whatever, except when whatever is our domain (you would
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# be better just bouncing all friend@ mail - this is just an example).
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/^friend@(?!my\.domain)/ 550 Stick this in your pipe $0
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# A multi-line entry. The text is sent as one line.
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#
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/^noddy@my\.domain$/
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550 This user is a funny one. You really don't want to send mail to
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them as it only makes their head spin.
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<b>EXAMPLE</b> <b>HEADER</b> <b>FILTER</b> <b>MAP</b>
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/^Subject: make money fast/ REJECT
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/^To: friend@public\.com/ REJECT
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2001-03-13 20:45:02 +03:00
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<b>SEE</b> <b>ALSO</b>
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<a href="regexp_table.5.html">regexp_table(5)</a> format of POSIX regular expression tables
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<b>AUTHOR(S)</b>
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The PCRE table lookup code was originally written by:
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Andrew McNamara
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andrewm@connect.com.au
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connect.com.au Pty. Ltd.
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Level 3, 213 Miller St
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North Sydney, NSW, Australia
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Adopted and adapted by:
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Wietse Venema
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IBM T.J. Watson Research
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P.O. Box 704
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Yorktown Heights, NY 10598, USA
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2002-02-03 02:10:24 +03:00
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1
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</pre> </body> </html>
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