Using regular expressions to separate apples from oranges

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perl::critic::policy::regularexpressions::requirelineboundarymat

Perl::Critic::Policy::RegularExpressions::RequireLineBouUseryContributedPerl::Critic::Policy::RegularExpressions::RequireLineBoundaryMatching(3pm)

NAME

       Perl::Critic::Policy::RegularExpressions::RequireLineBoundaryMatching - Always use the "/m" modifier with regular expressions.

AFFILIATION

       This Policy is part of the core Perl::Critic distribution.

DESCRIPTION

       Folks coming from a "sed" or "awk" background tend to assume that '$' and '^' match the beginning and end of the line, rather than then
       beginning and end 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

CONFIGURATION

       This Policy is not configurable except for the standard options.

NOTES

       For common regular expressions like e-mail addresses, phone numbers, dates, etc., have a look at the Regexp::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.

AUTHOR

       Jeffrey Ryan Thalhammer	<jeff@imaginative-software.com>

COPYRIGHT

       Copyright (c) 2005-2011 Imaginative Software Systems. 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.

perl v5.14.2							    2012Perl::Critic::Policy::RegularExpressions::RequireLineBoundaryMatching(3pm)

Shell Programming and Scripting