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Regexp::Common::URI::fax -- Returns a pattern for fax URIs.
    use Regexp::Common qw /URI/;
    while (<>) {
        /$RE{URI}{fax}/       and  print "Contains a fax URI.\n";
    }
Returns a pattern that matches fax URIs, as defined by RFC 2806.
Under {-keep}, the following are returned:
The complete URI.
The scheme.
The phone number, including any possible add-ons like ISDN subaddress, a post dial part, area specifier, service provider, etc.
$RE{URI}{fax}{nofuture}As above (including what's returned by {-keep}), with the exception
that future extensions are not allowed. Without allowing 
those future extensions, it becomes much easier to check a URI if
the correct syntax for post dial, service provider, phone context,
etc has been used - otherwise the regex could always classify them
as a future extension.
Mockapetris, P.: DOMAIN NAMES - IMPLEMENTATION AND SPECIFICATION. November 1987.
Berners-Lee, Tim, Fielding, R., and Masinter, L.: Uniform Resource Identifiers (URI): Generic Syntax. August 1998.
Vaha-Sipila, A.: URLs for Telephone Calls. April 2000.
$Log: fax.pm,v $ Revision 2.100 2003/02/10 21:06:38 abigail fax URI
the Regexp::Common::URI manpage for other supported URIs.
Damian Conway (damian@conway.org)
This package is maintained by Abigail (regexp-common@abigail.nl).
Bound to be plenty.
     Copyright (c) 2001 - 2003, Damian Conway. All Rights Reserved.
       This module is free software. It may be used, redistributed
      and/or modified under the terms of the Perl Artistic License
            (see http://www.perl.com/perl/misc/Artistic.html)