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  1. or download this
    $ perl -E'say "\x80" =~ /^\x80\z/ ?"match":"no match"'
match
  2. or download this
    $ perl -E'
    use encoding "UTF-8";
    say "\xC2\x80" =~ /^\N{U+0080}\z/ ?"match":"no match"
'
match
  3. or download this
    $ perl -E'
    use encoding "UTF-8";
...
    say $x =~ /^\Q$x\E\z/ ?"match":"no match"
'
match