This was also posted to the Perl5-Porters list, where it was answered by a handful of people (myself included), and you were given a possible course of action (Tie::IxHash).

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Jeff[japhy]Pinyan: Perl, regex, and perl hacker.
s++=END;++y(;-P)}y js++=;shajsj<++y(p-q)}?print:??;