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Perl::Critic:Perl::CriUser:ContributeduPerlxDocumentationohibitUselessTopic(3) NAME Perl::Critic::Policy::RegularExpressions::ProhibitUselessTopic - Don't use $_ to match against regexes. AFFILIATION This Policy is part of the Perl::Critic distribution. DESCRIPTION It is not necessary to specify the topic variable $_ when matching against a regular expression. Match or substitution operations are performed against variables, such as: $x =~ /foo/; $x =~ s/foo/bar/; $x =~ tr/a-mn-z/n-za-m/; If a variable is not specified, the match is against $_. # These are identical. /foo/; $_ =~ /foo/; # These are identical. s/foo/bar/; $_ =~ s/foo/bar/; # These are identical. tr/a-mn-z/n-za-m/; $_ =~ tr/a-mn-z/n-za-m/; This applies to negative matching as well. # These are identical if ( $_ !~ /DEBUG/ ) { ... if ( !/DEBUG ) { ... Including the "$_ =~" or "$_ !~" is unnecessary, adds complexity, and is not idiomatic Perl. CONFIGURATION This Policy is not configurable except for the standard options. AUTHOR Andy Lester <andy@petdance.com> COPYRIGHT Copyright (c) 2013 Andy Lester <andy@petdance.com> This library is free software; you can redistribute it and/or modify it under the terms of the Artistic License 2.0. perl v5.32.1 Perl::Critic::Policy::RegularExpressions::ProhibitUselessTopic(3)
NAME | AFFILIATION | DESCRIPTION | CONFIGURATION | AUTHOR | COPYRIGHT
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