phpman > perldoc > Regexp::Common::URI::gopher(3pm)

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.

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

AUTHOR
    Damian Conway (damian AT conway.org)

MAINTENANCE
    This package is maintained by Abigail (*regexp-common AT abigail.be*).

BUGS AND IRRITATIONS
    Bound to be plenty.

LICENSE and COPYRIGHT
    This software is Copyright (c) 2001 - 2017, 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 License.               See the file COPYRIGHT.BSD.
     4) The MIT License.               See the file COPYRIGHT.MIT.