$ perl -v | head -2 | tail -1
This is perl 5, version 30, subversion 0 (v5.30.0) built for cygwin-thread-multi

$ ./op_code.pl test_data
0.112352 read lines from disk and do RE.
0.096379 read lines from in-memory file and do RE.

$ ./op_code.pl test_data_Q
0.327187 read lines from disk and do RE.
398.730810 read lines from in-memory file and do RE.