Re^3: why doesnt my regex doesnt matches certain character?

Those are control characters of some type. That particular one is "Delete" - character \x7F. Assuming they are all the same, you can match against that. It might be better to match against a character class though, in case they vary.

Try:

$text =~ /\p{Control}/;

to match, or

$text =~ s/\p{Control}//g;

to remove.

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