Perl::CrPietrilc::::CProiltiiccy::::PRUoeslgeiurclyaC:ro:EnRxteprgriueblsuastrieEodxnpsPr:ee:rsPlsrioDohonicsbu:im:tePCnratopahttiuibroientWCiatphtouurteTWeistth(o3u)tTest(3)



NNAAMMEE
       Perl::Critic::Policy::RegularExpressions::ProhibitCaptureWithoutTest -
       Capture variable used outside conditional.

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

DDEESSCCRRIIPPTTIIOONN
       If a regexp match fails, then any capture variables ($1, $2, ...) will
       be undefined.  Therefore it's important to check the return value of a
       match before using those variables.

       This policy checks that the previous regexp for which the capture
       variable is in-scope is either in a conditional or causes an exception
       or other control transfer (i.e. "next", "last", "redo", "return", or
       sometimes "goto") if the match fails.

       A "goto" is only accepted by this policy if it is a co-routine call
       (i.e.  "goto &foo") or a "goto LABEL" where the label does not fall
       between the "goto" and the capture variable in the scope of the "goto".
       A computed "goto" (i.e. something like "goto (qw{foo bar baz})[$i]") is
       not accepted by this policy because its target can not be statically
       determined.

       This policy does not check whether that conditional is actually testing
       a regexp result, nor does it check whether a regexp actually has a
       capture in it.  Those checks are too hard.

       This policy also does not check arbitrarily complex conditionals
       guarding regexp results, for pretty much the same reason.  Simple
       things like

        m/(foo)/ or die "No foo!";
        die "No foo!" unless m/(foo)/;

       will be handled, but something like

        m/(foo) or do {
          ... lots of complicated calculations here ...
          die "No foo!";
        };

       are beyond its scope.

CCOONNFFIIGGUURRAATTIIOONN
       By default, this policy considers "die", "croak", and "confess" to
       throw exceptions. If you have additional subroutines or methods that
       may be used in lieu of one of these, you can configure them in your
       perlcriticrc as follows:

        [RegularExpressions::ProhibitCaptureWithoutTest]
        exception_source = my_exception_generator

BBUUGGSS
       This policy does not recognize named capture variables. Yet.

AAUUTTHHOORR
       Chris Dolan <cdolan@cpan.org>

CCOOPPYYRRIIGGHHTT
       Copyright (c) 2006-2010 Chris Dolan.

       This program is free software; you can redistribute it and/or modify it
       under the same terms as Perl itself.



perl v5.P1e2r.l2::Critic::Policy::Regul2a0r1E3x-p0r3e-s1s6ions::ProhibitCaptureWithoutTest(3)
