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

NAME
    Regexp::Common::URI::ftp -- Returns a pattern for FTP URIs.

SYNOPSIS
        use Regexp::Common qw /URI/;

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

DESCRIPTION
  $RE{URI}{FTP}{-type}{-password};
    Returns a regex for FTP URIs. Note: FTP URIs are not formally defined. RFC 1738 defines FTP
    URLs, but parts of that RFC have been obsoleted by RFC 2396. However, the differences between
    RFC 1738 and RFC 2396 are such that they aren't applicable straightforwardly to FTP URIs.

    There are two main problems:

    Passwords.
        RFC 1738 allowed an optional username and an optional password (separated by a colon) in the
        FTP URL. Hence, colons were not allowed in either the username or the password. RFC 2396
        strongly recommends passwords should not be used in URIs. It does allow for *userinfo*
        instead. This userinfo part may contain colons, and hence contain more than one colon. The
        regexp returned follows the RFC 2396 specification, unless the *{-password}* option is
        given; then the regex allows for an optional username and password, separated by a colon.

    The ;type specifier.
        RFC 1738 does not allow semi-colons in FTP path names, because a semi-colon is a reserved
        character for FTP URIs. The semi-colon is used to separate the path from the option *type*
        specifier. However, in RFC 2396, paths consist of slash separated segments, and each segment
        is a semi-colon separated group of parameters. Straigthforward application of RFC 2396 would
        mean that a trailing *type* specifier couldn't be distinguished from the last segment of the
        path having a two parameters, the last one starting with *type=*. Therefore we have opted to
        disallow a semi-colon in the path part of an FTP URI.

        Furthermore, RFC 1738 allows three values for the type specifier, *A*, *I* and *D* (either
        upper case or lower case). However, the internet draft about FTP URIs [DRAFT-FTP-URL] (which
        expired in May 1997) notes the lack of consistent implementation of the *D* parameter and
        drops *D* from the set of possible values. We follow this practise; however, RFC 1738
        behaviour can be archieved by using the *-type =* "[ADIadi]"> parameter.

    FTP URIs have the following syntax:

        "ftp:" "//" [ userinfo "@" ] host [ ":" port ]
                    [ "/" path [ ";type=" value ]]

    When using *{-password}*, we have the syntax:

        "ftp:" "//" [ user [ ":" password ] "@" ] host [ ":" port ]
                    [ "/" path [ ";type=" value ]]

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

    $1  The complete URI.

    $2  The scheme.

    $3  The userinfo, or if *{-password}* is used, the username.

    $4  If *{-password}* is used, the password, else "undef".

    $5  The hostname or IP address.

    $6  The port number.

    $7  The full path and type specification, including the leading slash.

    $8  The full path and type specification, without the leading slash.

    $9  The full path, without the type specification nor the leading slash.

    $10 The value of the type specification.

REFERENCES
    [DRAFT-URL-FTP]
        Casey, James: *A FTP URL Format*. November 1996.

    [RFC 1738]
        Berners-Lee, Tim, Masinter, L., McCahill, M.: *Uniform Resource Locators (URL)*. December
        1994.

    [RFC 2396]
        Berners-Lee, Tim, Fielding, R., and Masinter, L.: *Uniform Resource Identifiers (URI):
        Generic Syntax*. August 1998.

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.