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:

$1

The complete URI.

$2

The scheme.

$3

The phone number, including any possible add-ons like ISDN subaddress, a post dial part, area specifier, service provider, etc.

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.

[RFC 1035]

Mockapetris, P.: DOMAIN NAMES - IMPLEMENTATION AND SPECIFICATION. November 1987.

[RFC 2396]

Berners-Lee, Tim, Fielding, R., and Masinter, L.: Uniform Resource Identifiers (URI): Generic Syntax. August 1998.

[RFC 2806]

Vaha-Sipila, A.: URLs for Telephone Calls. April 2000.

Regexp::Common::URI for other supported URIs.

Damian Conway (damian@conway.org)

This package is maintained by Abigail (regexp-common@abigail.be).

Bound to be plenty.

This software is Copyright (c) 2001 - 2009, Damian Conway and Abigail.

This module is free software, and maybe used under any of the following licenses:

 1) The Perl Artistic License.     See the file COPYRIGHT.AL.
 2) The Perl Artistic License 2.0. See the file COPYRIGHT.AL2.
 3) The BSD Licence.               See the file COPYRIGHT.BSD.
 4) The MIT Licence.               See the file COPYRIGHT.MIT.