GSP
Quick Navigator

Search Site

Unix VPS
A - Starter
B - Basic
C - Preferred
D - Commercial
MPS - Dedicated
Previous VPSs
* Sign Up! *

Support
Contact Us
Online Help
Handbooks
Domain Status
Man Pages

FAQ
Virtual Servers
Pricing
Billing
Technical

Network
Facilities
Connectivity
Topology Map

Miscellaneous
Server Agreement
Year 2038
Credits
 

USA Flag

 

 

Man Pages


Manual Reference Pages  -  PERL::CRITIC::POLICY::REGULAREXPRESSIONS::PROHIBITSINGLECHARALTERNATION (3)

.ds Aq ’

NAME

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

CONTENTS

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

Search for    or go to Top of page |  Section 3 |  Main Index


perl v5.20.3 PERL::CRITIC::POLICY::REGULAREXPRESSIONS::PROHIBITSINGLECHARALTERNATION (3) 2016-04-03

Powered by GSP Visit the GSP FreeBSD Man Page Interface.
Output converted with manServer 1.07.