You only have one pattern: 
join "|" => keys %$args;

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That's the only pattern you use, so the answer is trivial. (Now, you probably want to know which of the clauses matched. But that's not an appropriate question. It takes a bit too much time to explain why the question isn't appropriate.)

Abigail

In reply to Re: Returning regexp pattern that was used to match by Abigail-II
in thread Returning regexp pattern that was used to match by crabbdean

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