/ 
Perl-Critic-1.083_002
River stage three • 131 direct dependents • 411 total dependents
/ Perl::Critic::Policy::RegularExpressions::RequireExtendedFormatting

NAME

Perl::Critic::Policy::RegularExpressions::RequireExtendedFormatting - Always use the /x modifier with regular expressions.

AFFILIATION

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

DESCRIPTION

Extended regular expression formatting allows you mix whitespace and comments into the pattern, thus making them much more readable.

# Match a single-quoted string efficiently...

m{'[^\\']*(?:\\.[^\\']*)*'};  #Huh?

#Same thing with extended format...

m{ '           #an opening single quote
   [^\\']      #any non-special chars (i.e. not backslash or single quote)
   (?:         #then all of...
      \\ .     #   any explicitly backslashed char
      [^\\']*  #   followed by an non-special chars
   )*          #...repeated zero or more times
   '           # a closing single quote
 }x;

CONFIGURATION

This Policy is not configurable except for the standard options.

NOTES

For common regular expressions like e-mail addresses, phone numbers, dates, etc., have a look at the Regex::Common module. Also, be cautions about slapping modifier flags onto existing regular expressions, as they can drastically alter their meaning. See http://www.perlmonks.org/?node_id=484238 for an interesting discussion on the effects of blindly modifying regular expression flags.

AUTHOR

Jeffrey Ryan Thalhammer <thaljef@cpan.org>

COPYRIGHT

Copyright (c) 2005-2008 Jeffrey Ryan Thalhammer. All 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.