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tempfile.txt is size 35 Mb
SV = PV(0x177f89db120) at 0x177f88bcca0
...
  COW_REFCNT = 2
0.004073 read lines from in-memory file and do RE (6 matches).

#!/usr/bin/env perl

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