Is there a way to itemize variables referenced in a piece of code that is stored in a scalar? For example, if I had this: 
my $foo = "$bar{foo}";
$foo .= $baz->method(@foo);
$foo .= join(',', @$bar{'foo','bar'});

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Then you'd be able to get a list that would contain something like:
qw[ $foo @foo %bar $bar $baz ];
I have a feeling this is either very hard, or already in a module somewhere, though I've found nothing helpful.

In reply to Finding Variable References In Code by tadman

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