in reply to Substitute some Unicodes with their escapes

Have you looked at HTML::Entities, which has

$encoded = encode_entities($input, '^\n\x20-\x25\x27-\x7e');

... which should be more or less what your table does.

If you have other characters that should not be encoded, you can add them to the above range.

Update: See also HTML::HTML5::Entities, which even allows you to bring your own entity tables.

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Re^2: Substitute some Unicodes with their escapes
by jjmoka (Beadle) on Jun 09, 2020 at 14:57 UTC
    That's another good idea. Thank you
Re^2: Substitute some Unicodes with their escapes
by Anonymous Monk on Jun 09, 2020 at 15:05 UTC
    Superficial glances at the source-code of each module indicates that both of them in their own way know about "&Ouml." I think you'll be in business with either one of them.