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Regexp::Common::URI::gopher

Section: User Contributed Perl Documentation (3)
Updated: 2003-03-23
Index Return to Main Contents
 

NAME

Regexp::Common::URI::gopher -- Returns a pattern for gopher URIs.  

SYNOPSIS

    use Regexp::Common qw /URI/;

    while (<>) {
        /$RE{URI}{gopher}/       and  print "Contains a gopher URI.\n";
    }

 

DESCRIPTION

 

$RE{URI}{gopher}{-notab}

Gopher URIs are poorly defined. Originally, RFC 1738 defined gopher URIs, but they were later redefined in an internet draft. One that was expired in June 1997.

The internet draft for gopher URIs defines them as follows:

    "gopher:" "//" host [ ":" port ] "/" gopher-type selector
                        [ "%09" search [ "%09" gopherplus_string ]]

Unfortunally, a selector is defined in such a way that characters may be escaped using the URI escape mechanism. This includes tabs, which escaped are %09. Hence, the syntax cannot distinguish between a URI that has both a selector and a search part, and an URI where the selector includes an escaped tab. (The text of the draft forbids tabs to be present in the selector though).

$RE{URI}{gopher} follows the defined syntax. To disallow escaped tabs in the selector and search parts, use $RE{URI}{gopher}{-notab}.

There are other differences between the text and the given syntax. According to the text, selector strings cannot have tabs, linefeeds or carriage returns in them. The text also allows the entire gopher-path, (the part after the slash following the hostport) to be empty; if this is empty the slash may be omitted as well. However, this isn't reflected in the syntax.

Under "{-keep}", the following are returned:

$1
The entire URI.
$2
The scheme.
$3
The host (name or address).
$4
The port (if any).
$5
The ``gopher-path'', the part after the / following the host and port.
$6
The gopher-type.
$7
The selector. (When no "{-notab}" is used, this includes the search and gopherplus_string, including the separating escaped tabs).
$8
The search, if given. (Only when "{-notab}" is given).
$9
The gopherplus_string, if given. (Only when "{-notab}" is given).

head1 REFERENCES

[RFC 1738]
Berners-Lee, Tim, Masinter, L., McCahill, M.: Uniform Resource Locators (URL). December 1994.
[RFC 1808]
Fielding, R.: Relative Uniform Resource Locators (URL). June 1995.
[GOPHER URL]
Krishnan, Murali R., Casey, James: ``A Gopher URL Format''. Expired Internet draft draft-murali-url-gopher. December 1996.
 

HISTORY

 $Log: gopher.pm,v $
 Revision 2.100  2003/02/21 14:40:59  abigail
 Gopher URLs

 

SEE ALSO

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

AUTHOR

Damian Conway (damian@conway.org)  

MAINTAINANCE

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

BUGS AND IRRITATIONS

Bound to be plenty.  

COPYRIGHT

     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)


 

Index

NAME
SYNOPSIS
DESCRIPTION
$RE{URI}{gopher}{-notab}
HISTORY
SEE ALSO
AUTHOR
MAINTAINANCE
BUGS AND IRRITATIONS
COPYRIGHT

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