I'd pass $key_val in as a third parameter (actually the second parameter with $key the last). However, that doesn't seem to be the real problem. I suspect all you need to do is assign an empty hash to $key_val between iterations to clear the previous contents.

True laziness is hard work

In reply to Re^3: Recursive search in nested hash for selective keys by GrandFather
in thread Recursive search in nested hash for selective keys by perlpal

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