Try Regexp::List. It converts qw/foobar fooxar foozap fooza/ to qr/foo(?:[bx]ar|zap?)/ using Trie structure so that the resulting regex is much more efficient than naive /foobar|fooxar|.../. And tillys approach to counting each word by capturing the match sounds great.
--kap

In reply to Re: Count multiple pattern matches by kappa
in thread Count multiple pattern matches by johnnywang

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