1Regexp::Common::URI::goUpsheerr(C3o)ntributed Perl DocumReengteaxtpi:o:nCommon::URI::gopher(3)
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NAME

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

9           use Regexp::Common qw /URI/;
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11           while (<>) {
12               /$RE{URI}{gopher}/       and  print "Contains a gopher URI.\n";
13           }
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DESCRIPTION

16       $RE{URI}{gopher}{-notab}
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18       Gopher URIs are poorly defined. Originally, RFC 1738 defined gopher
19       URIs, but they were later redefined in an internet draft. One that was
20       expired in June 1997.
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22       The internet draft for gopher URIs defines them as follows:
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24           "gopher:" "//" host [ ":" port ] "/" gopher-type selector
25                               [ "%09" search [ "%09" gopherplus_string ]]
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27       Unfortunally, a selector is defined in such a way that characters may
28       be escaped using the URI escape mechanism. This includes tabs, which
29       escaped are %09. Hence, the syntax cannot distinguish between a URI
30       that has both a selector and a search part, and an URI where the selec‐
31       tor includes an escaped tab. (The text of the draft forbids tabs to be
32       present in the selector though).
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34       $RE{URI}{gopher} follows the defined syntax. To disallow escaped tabs
35       in the selector and search parts, use $RE{URI}{gopher}{-notab}.
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37       There are other differences between the text and the given syntax.
38       According to the text, selector strings cannot have tabs, linefeeds or
39       carriage returns in them. The text also allows the entire gopher-path,
40       (the part after the slash following the hostport) to be empty; if this
41       is empty the slash may be omitted as well. However, this isn't
42       reflected in the syntax.
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44       Under "{-keep}", the following are returned:
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46       $1  The entire URI.
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48       $2  The scheme.
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50       $3  The host (name or address).
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52       $4  The port (if any).
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54       $5  The "gopher-path", the part after the / following the host and
55           port.
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57       $6  The gopher-type.
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59       $7  The selector. (When no "{-notab}" is used, this includes the search
60           and gopherplus_string, including the separating escaped tabs).
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62       $8  The search, if given. (Only when "{-notab}" is given).
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64       $9  The gopherplus_string, if given. (Only when "{-notab}" is given).
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66       head1 REFERENCES
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68       [RFC 1738]
69           Berners-Lee, Tim, Masinter, L., McCahill, M.: Uniform Resource
70           Locators (URL). December 1994.
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72       [RFC 1808]
73           Fielding, R.: Relative Uniform Resource Locators (URL). June 1995.
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75       [GOPHER URL]
76           Krishnan, Murali R., Casey, James: "A Gopher URL Format". Expired
77           Internet draft draft-murali-url-gopher. December 1996.
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HISTORY

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

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

88       Damian Conway (damian@conway.org)
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MAINTAINANCE

91       This package is maintained by Abigail (regexp-common@abigail.nl).
92

BUGS AND IRRITATIONS

94       Bound to be plenty.
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97            Copyright (c) 2001 - 2003, Damian Conway. All Rights Reserved.
98              This module is free software. It may be used, redistributed
99             and/or modified under the terms of the Perl Artistic License
100                   (see http://www.perl.com/perl/misc/Artistic.html)
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104perl v5.8.8                       2003-03-23    Regexp::Common::URI::gopher(3)
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