It's almost certainly to do with running the regex on both the key and the value of the hash. Probably some of the values of a packlist object (returned by ExtUtils::Installed->new->packlist()) are undefined... Is there a function of that packlist that returns what you want, rather than dumping the whole object hash?

There's no point in doing /match/ && s/match/foo/ that's silly. Instead, try something like  defined && s/match/foo/ inside the grep.

But know what you want to run the substitution on first (and other people have suggested this, I know) and do it only on those...

In reply to Re: warnings and grep problem by Jasper
in thread warnings and grep problem by jeanluca

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