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perl 11157166.pl
tempfile.txt is size 29 Mb
0.133742 read lines from disk and do RE (2047 matches).
0.079146 read lines from in-memory file and do RE (2047 matches).

tempfile.txt is size 29 Mb
0.057704 read lines from disk and do RE (2047 matches).
0.805546 read lines from in-memory file and do RE (2047 matches).

#!/usr/bin/env perl

...
}
printf "%f read lines from in-memory file and do RE ($match_count2 mat
+ches).\n", time - $time;