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    You seem to have misunderstood the question: it's to match names that may contain a newline, not match that must contain a newline. With GNU find, find -regex '.*' does not match file names containing newlines. Commented Sep 1, 2021 at 20:35
  • @Gilles'SO-stopbeingevil' Thanks. Updated. Commented Sep 1, 2021 at 20:38
  • The updated answer works for the specific toy example in the question, but isn't generalizable to any other case. Commented Sep 1, 2021 at 20:40
  • @Gilles'SO-stopbeingevil' It's difficult to see what cases they need covered and what doesn't work. It's a literal solution to their actual question. Commented Sep 1, 2021 at 20:42
  • @Kusalananda, they're asking "how to write the regex so that [it] will match newlines", and mentioning (?s) and .../s, both of which are ways in Perl for enabling the s option to the regex. By default, the . in Perl doesn't match newlines, but with the s option it does. Try e.g. perl -e 'print "yes\n" if "foo\nbar" =~ /foo.bar/' vs. =~ /foo.bar/s or =~ /(?s)foo.bar/' Commented Sep 1, 2021 at 20:53