in reply to How to remove wide chars (ex: 年 or &#x6216) from a text file?

my $badstuff = read_file( $file,  { binmode => ':raw' } );
$string =~  s/\Q$badstuff\E//;

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now $string no longer has $badstuff, whatever it is

see File::Slurp, binmode, quotemeta, Data::Dump

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