You're attempting to use the number of keys which matched to initialize a hash. Trying to use a single scalar to initialize a hash isn't going to produce anything useful. 

my @desired_keys = grep { /\Q$dir\E.*?\.pm$/ } keys %$packlist;
my %hash;
@hash{ map { /\Q$dir\E(\w+?)\.pm$/; $1 } @desired_keys } = @desired_ke
+ys;

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Update: Gah. Me no write well. Reworded to (hopefully) clarify.

In reply to Re^3: warnings and grep problem by Fletch
in thread warnings and grep problem by jeanluca

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