Modifying my code so 16.3% of the lines will match the regex (previously it was 1%) gives me these timings for Strawberry Perl 5.38:

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).

[download]

So consistent with your results for Strawberry Perl.

And for MSYS2 perl 5.38.2:

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).

[download]

So something would appear to be awry with the regex matching under MSYS2 and Cygwin.

In reply to Re^3: RE on lines read from in-memory scalar is very slow by swl
in thread RE on lines read from in-memory scalar is very slow by Danny

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