in reply to Substituting unicode character leaves special block
Please shows us the output of Devel::Peek::Dump() before and after the substitution.
See https://perldoc.perl.org/utf8 for more on the two flavors of strings in Perl, octet strings and character strings.
Cheers Rolf
(addicted to the 𐍀𐌴𐍂𐌻 Programming Language :)
Wikisyntax for the Monastery
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