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| author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-06 01:46:30 +0000 |
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| committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-06 01:46:30 +0000 |
| commit | b5896ba9f6047e7031e2bdee0622d543e11a6734 (patch) | |
| tree | fd7b460593a2fee1be579bec5697e6d887ea3421 /html/regexp_table.5.html | |
| parent | Initial commit. (diff) | |
| download | postfix-b5896ba9f6047e7031e2bdee0622d543e11a6734.tar.xz postfix-b5896ba9f6047e7031e2bdee0622d543e11a6734.zip | |
Adding upstream version 3.4.23.upstream/3.4.23upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'html/regexp_table.5.html')
| -rw-r--r-- | html/regexp_table.5.html | 187 |
1 files changed, 187 insertions, 0 deletions
diff --git a/html/regexp_table.5.html b/html/regexp_table.5.html new file mode 100644 index 0000000..468f7af --- /dev/null +++ b/html/regexp_table.5.html @@ -0,0 +1,187 @@ +<!doctype html public "-//W3C//DTD HTML 4.01 Transitional//EN" + "http://www.w3.org/TR/html4/loose.dtd"> +<html> <head> +<meta http-equiv="Content-Type" content="text/html; charset=us-ascii"> +<title> Postfix manual - regexp_table(5) </title> +</head> <body> <pre> +REGEXP_TABLE(5) REGEXP_TABLE(5) + +<b>NAME</b> + regexp_table - format of Postfix regular expression tables + +<b>SYNOPSIS</b> + <b>postmap -q "</b><i>string</i><b>" <a href="regexp_table.5.html">regexp</a>:/etc/postfix/</b><i>filename</i> + + <b>postmap -q - <a href="regexp_table.5.html">regexp</a>:/etc/postfix/</b><i>filename</i> <<i>inputfile</i> + +<b>DESCRIPTION</b> + The Postfix mail system uses optional tables for address rewriting, + mail routing, or access control. These tables are usually in <b>dbm</b> or <b>db</b> + 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. When a match is found, the corresponding result is returned and + the search is terminated. + + To find out what types of lookup tables your Postfix system supports + use the "<b>postconf -m</b>" command. + + To test lookup tables, use the "<b>postmap -q</b>" command as described in the + SYNOPSIS above. Use "<b>postmap -hmq -</b> <<i>file</i>" for <a href="header_checks.5.html">header_checks(5)</a> pat- + terns, and "<b>postmap -bmq -</b> <<i>file</i>" for <a href="header_checks.5.html">body_checks(5)</a> (Postfix 2.6 and + later). + +<b>COMPATIBILITY</b> + With Postfix version 2.2 and earlier specify "<b>postmap -fq</b>" to query a + table that contains case sensitive patterns. Patterns are case insensi- + tive by default. + +<b>TABLE FORMAT</b> + The general form of a Postfix regular expression table is: + + <b>/</b><i>pattern</i><b>/</b><i>flags result</i> + When <i>pattern</i> matches the input string, use the corresponding + <i>result</i> value. + + <b>!/</b><i>pattern</i><b>/</b><i>flags result</i> + When <i>pattern</i> does <b>not</b> match the input string, use the corre- + sponding <i>result</i> value. + + <b>if /</b><i>pattern</i><b>/</b><i>flags</i> + + <b>endif</b> If the input string matches /<i>pattern</i>/, then match that input + string against the patterns between <b>if</b> and <b>endif</b>. The <b>if</b>..<b>endif</b> + can nest. + + Note: do not prepend whitespace to patterns inside <b>if</b>..<b>endif</b>. + + This feature is available in Postfix 2.1 and later. + + <b>if !/</b><i>pattern</i><b>/</b><i>flags</i> + + <b>endif</b> If the input string does not match /<i>pattern</i>/, then match that + input string against the patterns between <b>if</b> and <b>endif</b>. The + <b>if</b>..<b>endif</b> can nest. + + Note: do not prepend whitespace to patterns inside <b>if</b>..<b>endif</b>. + + This feature is available in Postfix 2.1 and later. + + 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 <b>re_format</b>(7) with + 4.4BSD, in <b>regex</b>(5) with Solaris, and in <b>regex</b>(7) with Linux. Other + systems may use other document names. + + The expression delimiter can be any non-alphanumerical character, + except whitespace 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 controlled by flags, which are + toggled by appending one or more of the following characters after the + pattern: + + <b>i</b> (default: on) + Toggles the case sensitivity flag. By default, matching is case + insensitive. + + <b>m</b> (default: off) + Toggle the multi-line mode flag. When this flag is on, the <b>^</b> and + <b>$</b> metacharacters match immediately after and immediately before + a newline character, respectively, in addition to matching at + the start and end of the input string. + + <b>x</b> (default: on) + Toggles the extended expression syntax flag. By default, support + for extended expression syntax is enabled. + +<b>TABLE SEARCH ORDER</b> + 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 <i>user@domain</i> mail addresses are not bro- + ken up into their <i>user</i> and <i>domain</i> constituent parts, nor is <i>user+foo</i> + broken up into <i>user</i> and <i>foo</i>. + +<b>TEXT SUBSTITUTION</b> + 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 $(n) if + they aren't followed by whitespace. + + Note: since negated patterns (those preceded by <b>!</b>) return a result when + the expression does not match, substitutions are not available for + negated patterns. + +<b>EXAMPLE SMTPD ACCESS MAP</b> + # Disallow sender-specified routing. This is a must if you relay mail + # for other domains. + /[%!@].*[%!@]/ 550 Sender-specified routing rejected + + # Postmaster is OK, that way they can talk to us about how to fix + # their problem. + /^postmaster@/ OK + + # Protect your outgoing majordomo exploders + if !/^owner-/ + /^(.*)-outgoing@(.*)$/ 550 Use ${1}@${2} instead + endif + +<b>EXAMPLE HEADER FILTER MAP</b> + # These were once common in junk mail. + /^Subject: make money fast/ REJECT + /^To: friend@public\.com/ REJECT + +<b>EXAMPLE BODY FILTER MAP</b> + # First skip over base 64 encoded text to save CPU cycles. + ~^[[:alnum:]+/]{60,}$~ OK + + # Put your own body patterns here. + +<b>SEE ALSO</b> + <a href="postmap.1.html">postmap(1)</a>, Postfix lookup table manager + <a href="pcre_table.5.html">pcre_table(5)</a>, format of PCRE tables + <a href="cidr_table.5.html">cidr_table(5)</a>, format of CIDR tables + +<b>README FILES</b> + <a href="DATABASE_README.html">DATABASE_README</a>, Postfix lookup table overview + +<b>AUTHOR(S)</b> + The regexp table lookup code was originally written by: + LaMont Jones + lamont@hp.com + + That code was based on the PCRE dictionary contributed 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 + + Wietse Venema + Google, Inc. + 111 8th Avenue + New York, NY 10011, USA + + REGEXP_TABLE(5) +</pre> </body> </html> |