in reply to
Maybe Escape in Dynamic RegExps
This does what you want.
my $re = qr/(?<!\Q$c\E)\Q$d\E/;
The \Q . . \E pair is like quotemeta. I've changed the names to protect sort. Extra ( . . ) delimiter pair is cut.
Electric dreams (yikes!)
2001: A Space Odyssey
None of the above, please specify
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