One more possible optimization: when you want to check for the presence of constant strings (e.g. Index, USDSWAP) in the input, you can use if (index($_, 'USDSWAP') != -1) { ... } instead of a regex.

In reply to Re^2: Multithreading a large file split to multiple files by Anonymous Monk
in thread Multithreading a large file split to multiple files by 10isitch

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