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           postmap -q "string" pcre:/etc/postfix/filename
           postmap -q - pcre:/etc/postfix/filename <inputfile


           The  Postfix  mail  system  uses optional tables for address rewriting,
           mail routing, or access control. These tables are usually in dbm or  db
           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.  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 "postconf -m" command.
           To test lookup tables, use the "postmap -q" command as described in the
           SYNOPSIS above.


           With Postfix version 2.2 and earlier specify "postmap -fq" to  query  a
           table that contains case sensitive patterns. Patterns are case insensi-
           tive by default.


           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 corre-
                  sponding 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 pat-
                  tern. The if..endif can nest.
                  Note: do not prepend whitespace to patterns inside if..endif.
                  This feature is available in Postfix 2.1 and later.
           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 pat-
                  tern. The if..endif can nest.
           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
           i (default: on)
                  Toggles the case sensitivity flag. By default, matching is  case
           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 ver-
                  sions prior to 2.0, The flag is off by default, which is  incon-
                  venient 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 pat-
                  tern, escape it with backslash.
                  Note: do not use #comment after patterns.
           A (default: off)
                  Toggles the PCRE_ANCHORED 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.
           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 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 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  quanti-
                  fiers  so that they are not greedy by default, but become greedy
           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.


           Substitution of substrings from the matched expression into the  result
           string  is  possible using the conventional perl syntax ($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 !) return a result when
           the  expression  does  not  match,  substitutions are not available for
           negated patterns.


           # 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.
            550 This user is a funny one. You really don't want to send mail to
            them as it only makes their head spin.


           /^Subject: make money fast/     REJECT
           /^To: friend@public\.com/       REJECT


           # First skip over base 64 encoded text to save CPU cycles.
           # Requires PCRE version 3.
           ~^[[:alnum:]+/]{60,}$~          OK
           # Put your own body patterns here.


           postmap(1), Postfix lookup table manager
           postconf(5), configuration parameters
           regexp_table(5), format of POSIX regular expression tables


           Use "postconf readme_directory" or "postconf html_directory" to  locate
           this information.
           DATABASE_README, Postfix lookup table overview

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