10-09-2012
Help needed in regex
Hi,
Could you please help me in writing a regex for the following requirement?
Let following be the string format:
abc.cdef.ghij.lm
I need to check between dots, there is atleast one character{a-z,A-Z,*}.
Eg: abc1.gt2.345j is valid, but not 123.abc.vff.gth because 123 should not be allowed.
Thanks in advance!
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LEARN ABOUT CENTOS
perl::critic::policy::regularexpressions::prohibitsinglecharalte
Perl::Critic::Policy::RegularExpressions::ProhibitSingleUserAContributedPerl::Critic::Policy::RegularExpressions::ProhibitSingleCharAlternation(3)
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 v5.16.3 2014Perl::Critic::Policy::RegularExpressions::ProhibitSingleCharAlternation(3)