The idea with the hash won't work, because the regex match searches for a matching substring, the hash lookup compares the whole string.

But that reminds me of another possible optimization: if @tag doesn't contain regexes but only constant substrings, index might speed up things.

So instead of if ($_ =~ m/$something/){ ... }, you can write if (0 <= index $_, $something).

In reply to Re^2: Better solution to the code by moritz
in thread Better solution to the code by Anonymous Monk

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