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.IX Title "Perl::Critic::Policy::Variables::ProhibitMatchVars 3pm"
.TH Perl::Critic::Policy::Variables::ProhibitMatchVars 3pm 2023-07-26 "perl v5.38.0" "User Contributed Perl Documentation"
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.SH NAME
Perl::Critic::Policy::Variables::ProhibitMatchVars \- Avoid "$\`", "$&", "$\*(Aq" and their English equivalents.
.SH AFFILIATION
.IX Header "AFFILIATION"
This Policy is part of the core Perl::Critic
distribution.
.SH DESCRIPTION
.IX Header "DESCRIPTION"
Using the "match variables" \f(CW\*(C`$\`\*(C'\fR, \f(CW$&\fR, and/or \f(CW\*(C`$\*(Aq\*(C'\fR can
significantly degrade the performance of a program.  This policy
forbids using them or their English equivalents.  See \fBperldoc
English\fR or PBP page 82 for more information.
.PP
It used to forbid plain \f(CW\*(C`use English;\*(C'\fR 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.
.SH CONFIGURATION
.IX Header "CONFIGURATION"
This Policy is not configurable except for the standard options.
.SH AUTHOR
.IX Header "AUTHOR"
Chris Dolan <cdolan@cpan.org>
.SH COPYRIGHT
.IX Header "COPYRIGHT"
Copyright (c) 2006\-2011 Chris Dolan.
.PP
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.