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X{1234}

\x{1234}      # \x{...}, not \X{...} or X{...}

/\X{1F00-1FE3}/

/[\x{1F00}-\x{1FE3}]/

utf8::encode($_[0]);

sub is_vowel {
    return $_[0] =~ /
...
        \z
    /x;
}