tempfile.txt is size 29 Mb
0.121952 read lines from disk and do RE (32571 matches).
0.491674 read lines from in-memory file and do RE (32571 matches).

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tempfile.txt is size 29 Mb
0.064073 read lines from disk and do RE (32571 matches).
9.538524 read lines from in-memory file and do RE (32571 matches).