Jeffrey Ryan Thalhammer > Perl-Critic-1.122 > Perl::Critic::Policy::RegularExpressions::RequireLineBoundaryMatching

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Module Version: 1.122   Source  

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.

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