If your 35,000 sort patterns clump, then you might want to sort them into a tree, so when you sweep through the 1.5 million lines (only once) by walking the tree to find each incremental match, you can hold partial matches, and immediately discard those that don't meet the essential criteria.

Just a thought,
-v
"Perl. There is no substitute."

In reply to Re: Best way to find patterns in csv file? by Velaki
in thread Best way to find patterns in csv file? by punch_card_don

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