NAME¶
Perl::Critic::Policy::Variables::ProhibitMatchVars - Avoid "$`",
"$&", "$'" and their English equivalents.
AFFILIATION¶
This Policy is part of the core Perl::Critic distribution.
DESCRIPTION¶
Using the "match variables" "$`", $&, and/or
"$'" can significantly degrade the performance of a program. This
policy forbids using them or their English equivalents. See
perldoc
English or PBP page 82 for more information.
It used to forbid plain "use English;" because it ends up causing the
performance side-effects of the match variables. However, the message emitted
for that situation was not at all clear and there is now
Perl::Critic::Policy::Modules::RequireNoMatchVarsWithUseEnglish, which
addresses this situation directly.
CONFIGURATION¶
This Policy is not configurable except for the standard options.
AUTHOR¶
Chris Dolan <cdolan@cpan.org>
COPYRIGHT¶
Copyright (c) 2006-2011 Chris Dolan.
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.