NAME

       Perl::Critic::Policy::RegularExpressions::ProhibitSingleCharAlternation - Use "[abc]"
       instead of "a|b|c".

AFFILIATION

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

DESCRIPTION

       Character classes (like "[abc]") are significantly faster than single character
       alternations (like "(?:a|b|c)").  This policy complains if you have more than one instance
       of a single character in an alternation.  So "(?:a|the)" is allowed, but "(?:a|e|i|o|u)"
       is not.

       NOTE: Perl 5.10 (not released as of this writing) has major regexp optimizations which may
       mitigate the performance penalty of alternations, which will be rewritten behind the
       scenes as something like character classes.  Consequently, if you are deploying
       exclusively on 5.10, yo might consider ignoring this policy.

CONFIGURATION

       This Policy is not configurable except for the standard options.

CREDITS

       Initial development of this policy was supported by a grant from the Perl Foundation.

AUTHOR

       Chris Dolan <cdolan@cpan.org>

COPYRIGHT

       Copyright (c) 2007-2011 Chris Dolan.  Many 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 v5.20.2         Perl::Critic::Policy::RegularExpressions::ProhibitSingleCharAlternation(3pm)