Thank you for your input, and my apology. I realized that my script is grabbing a wrong version of file that already has non-breaking space having as "\_" for some reason. After grabbing the correct version of file set, it's behaving as expected. Thank you as well for pointing me to https://www.perlmonks.org/?node_id=1233709

In reply to Re^2: Unexpected behavior of Perl on non-breaking space in Mac environment by hishii2001
in thread Unexpected behavior of Perl on non-breaking space in Mac environment by hishii2001

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