—

              
##############################################################################
#      $URL: http://perlcritic.tigris.org/svn/perlcritic/trunk/Perl-Critic/lib/Perl/Critic/Policy/RegularExpressions/RequireLineBoundaryMatching.pm $
#     $Date: 2008-05-17 00:26:31 -0500 (Sat, 17 May 2008) $
#   $Author: clonezone $
# $Revision: 2340 $
##############################################################################
package Perl::Critic::Policy::RegularExpressions::RequireLineBoundaryMatching;
use strict;
use warnings;
use Readonly;
use Perl::Critic::Utils qw{ :severities };
use Perl::Critic::Utils::PPIRegexp qw{ &get_modifiers };
use base 'Perl::Critic::Policy';
our $VERSION = '1.083_002';
#-----------------------------------------------------------------------------
Readonly::Scalar my $DESC => q{Regular expression without "/m" flag};
Readonly::Scalar my $EXPL => [ 237 ];
#-----------------------------------------------------------------------------
sub supported_parameters { return ()                    }
sub default_severity     { return $SEVERITY_LOW         }
sub default_themes       { return qw(core pbp cosmetic) }
sub applies_to           { return qw(PPI::Token::Regexp::Match
                                     PPI::Token::Regexp::Substitute
                                     PPI::Token::QuoteLike::Regexp) }
#-----------------------------------------------------------------------------
sub violates {
    my ( $self, $elem, undef ) = @_;
    my %mods = get_modifiers($elem);
    if ( ! $mods{m} ) {
        return $self->violation( $DESC, $EXPL, $elem );
    }
    return; #ok!;
}
1;
__END__
#-----------------------------------------------------------------------------
HideShow 51 lines of Pod
=pod
=head1 NAME
Perl::Critic::Policy::RegularExpressions::RequireLineBoundaryMatching - Always use the C</m> modifier with regular expressions.
=head1 AFFILIATION
This Policy is part of the core L<Perl::Critic> distribution.
=head1 DESCRIPTION
Folks coming from a C<sed> or C<awk> background tend to assume that
C<'$'> and C<'^'> match the beginning and and of the line, rather than
then beginning and ed of the string.  Adding the '/m' flag to your
regex makes it behave as most people expect it should.
  my $match = m{ ^ $pattern $ }x;  #not ok
  my $match = m{ ^ $pattern $ }xm; #ok
=head1 CONFIGURATION
This Policy is not configurable except for the standard options.
=head1 NOTES
For common regular expressions like e-mail addresses, phone numbers,
dates, etc., have a look at the L<Regex::Common> module.  Also, be
cautions about slapping modifier flags onto existing regular
expressions, as they can drastically alter their meaning.  See
L<http://www.perlmonks.org/?node_id=484238> for an interesting
discussion on the effects of blindly modifying regular expression
flags.
=head1 AUTHOR
Jeffrey Ryan Thalhammer  <thaljef@cpan.org>
=head1 COPYRIGHT
Copyright (c) 2005-2008 Jeffrey Ryan Thalhammer. All rights reserved.
This program is free software; you can redistribute it and/or modify
it under the same terms as Perl itself.  The full text of this license
can be found in the LICENSE file included with this module.
=cut
# Local Variables:
#   mode: cperl
#   cperl-indent-level: 4
#   fill-column: 78
#   indent-tabs-mode: nil
#   c-indentation-style: bsd
# End:
# ex: set ts=8 sts=4 sw=4 tw=78 ft=perl expandtab shiftround :