Thanks for that very detailed answer, but let me reduce my question to this:
#!/usr/bin/perl
$str = 'it's a smart quote';
if ($str =~ m/\x{2019}/){
print "found"
} else {
print "not found"
}
BBEdit confirms that the third char in 'it's a smart quote' is 2019,
but the regex doesn't match, with or without "use utf8".
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