$ perl -v | head -2 | tail -1
This is perl 5, version 39, subversion 3 (v5.39.3) built for cygwin-thread-multi

$ ./op_code.pl test_data
0.111368 read lines from disk and do RE.
0.096441 read lines from in-memory file and do RE.

$ ./op_code.pl test_data_Q
0.356852 read lines from disk and do RE.
398.759730 read lines from in-memory file and do RE.