That would cause a problem if $opt_d equals ^. Perl seems to handle the cases /[-]/, /[[]/, /[]]/ as the appropriate single character class, but it trips on /[^]/. I wonder whether that's a bug (or a yet unimplemented feature).
Of course, you can get all sorts of unexpected nonsense if $opt_d is longer than a single character. Or if it's the empty string.
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