Perl::Critic::Policy::RegularExpressions::RequireLineBoundaryMatching - Always use the /m modifier with regular expressions.
This Policy is part of the core Perl::Critic distribution.
Folks coming from a sed or awk background tend to assume that
'$' and '^' 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
This Policy is not configurable except for the standard options.
For common regular expressions like e-mail addresses, phone numbers, dates, etc., have a look at the Regex::Common module. Also, be cautions about slapping modifier flags onto existing regular expressions, as they can drastically alter their meaning. See http://www.perlmonks.org/?node_id=484238 for an interesting discussion on the effects of blindly modifying regular expression flags.
Jeffrey Ryan Thalhammer <thaljef@cpan.org>
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.