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package WWW::FairViewer::RegularExpressions;
use utf8;
use 5.014;
use warnings;
require Exporter;
our @ISA = qw(Exporter);
=head1 NAME
WWW::FairViewer::RegularExpressions - Various utils.
=head1 SYNOPSIS
use WWW::FairViewer::RegularExpressions;
use WWW::FairViewer::RegularExpressions ($get_video_id_re);
=cut
my $opt_begin_chars = q{:;=}; # stdin option valid begin chars
# Options
our $range_num_re = qr{^([0-9]{1,3}+)(?>-|\.\.)([0-9]{1,3}+)?\z};
our $digit_or_equal_re = qr/(?(?=[1-9])|=)/;
our $non_digit_or_opt_re = qr{^(?!$range_num_re)(?>[0-9]{1,3}[^0-9]|[0-9]{4}|[^0-9$opt_begin_chars])};
# Generic name
my $generic_name_re = qr/[a-zA-Z0-9_.\-]{11,64}/;
our $valid_channel_id_re = qr{^(?:.*/channel/)?(?<channel_id>(?:\w+(?:[-.]++\w++)*|$generic_name_re))(?:/.*)?\z};
our $get_channel_videos_id_re = qr{^.*/channel/(?<channel_id>(?:\w+(?:[-.]++\w++)*|$generic_name_re))};
our $get_channel_playlists_id_re = qr{$get_channel_videos_id_re/playlists};
our $get_username_videos_re = qr{^.*/user/(?<username>[-.\w]+)};
our $get_username_playlists_re = qr{$get_username_videos_re/playlists};
# Video ID
my $video_id_re = qr/[0-9A-Za-z_\-]{11}/;
our $valid_video_id_re = qr{^$video_id_re\z};
our $get_video_id_re = qr{(?:%3F|\b)(?>v|embed|youtu(?:\\)?[.]be)(?>(?:\\)?[=/]|%3D)(?<video_id>$video_id_re)};
# Playlist ID
our $valid_playlist_id_re = qr{^$generic_name_re\z};
our $get_playlist_id_re = qr{(?:(?:(?>playlist\?list|view_play_list\?p|list)=)|\w#p/c/)(?<playlist_id>$generic_name_re)\b};
our $valid_opt_re = qr{^[$opt_begin_chars]([A-Za-z]++(?:-[A-Za-z]++)?(?>${digit_or_equal_re}.*)?)$};
our @EXPORT = qw(
$range_num_re
$digit_or_equal_re
$non_digit_or_opt_re
$valid_channel_id_re
$valid_video_id_re
$get_video_id_re
$valid_playlist_id_re
$get_playlist_id_re
$valid_opt_re
$get_channel_videos_id_re
$get_channel_playlists_id_re
$get_username_videos_re
$get_username_playlists_re
);
=head1 AUTHOR
Trizen, C<< <echo dHJpemVuQHByb3Rvbm1haWwuY29tCg== | base64 -d> >>
Jesus, C<< <echo aGVja3llbEBoeXBlcmJvbGEuaW5mbw== | base64 -d> >>
=head1 SUPPORT
You can find documentation for this module with the perldoc command.
perldoc WWW::FairViewer::RegularExpressions
=head1 LICENSE AND COPYRIGHT
Copyright 2012-2013 Trizen.
Copyright 2020 Jesus E.
This program is free software; you can redistribute it and/or modify it
under the terms of either: the GNU General Public License as published
by the Free Software Foundation; or the Artistic License.
See L<http://dev.perl.org/licenses/> for more information.
=cut
1; # End of WWW::FairViewer::RegularExpressions
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