NAME

       Courier::Filter::Util - Utility class used by the Courier::Filter framework

SYNOPSIS

           use Courier::Filter::Util qw(
               ipv4_address_pattern
               ipv6_address_pattern
               loopback_address_pattern
           );

           $message->remote_host =~ / ^ (?: ::ffff: )? $(\ipv4_address_pattern} $ /x;
           $message->remote_host =~ / ^ $(\ipv6_address_pattern} $ /x;
           $message->remote_host =~ / ^ ${\loopback_address_pattern} $ /x;

DESCRIPTION

       Courier::Filter::Util is Courier::Filter's utility class.

   Constants
       The following constants are provided:

       ipv4_address_pattern
           A regular expression matching an IPv4 address in "dotted decimal" notation.

       ipv6_address_pattern
           A regular expression matching an IPv6 address in full RFC 4291 syntax.

       loopback_address_pattern
           A regular expression matching an IPv4 or IPv6 loopback address ("127.n.n.n",
           "::ffff:127.n.n.n.n", "::1").

SEE ALSO

       Courier::Filter.

       For AVAILABILITY, SUPPORT, and LICENSE information, see Courier::Filter::Overview.

AUTHOR

       Julian Mehnle <julian@mehnle.net>