Manual Reference Pages - PERL::CRITIC::POLICY::REGULAREXPRESSIONS::PROHIBITSINGLECHARALTERNATION (3)
Perl::Critic::Policy::RegularExpressions::ProhibitSingleCharAlternation - Use "[abc]" instead of "a|b|c".
This Policy is part of the core Perl::Critic
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.
This Policy is not configurable except for the standard options.
Initial development of this policy was supported by a grant from the
Chris Dolan <firstname.lastname@example.org>
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 v5.20.3 ||PERL::CRITIC::POLICY::REGULAREXPRESSIONS::PROHIBITSINGLECHARALTERNATION (3) ||2016-04-03 |
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