This test demonstrates code that has worked for me until 5.17.0. It fails in 5.17.0 and higher.
#!/usr/bin/env perl
use strict;
use warnings;
use Test::More tests => 2;
my $str = ' Foo '; # uppercase breaks 2nd regex
my $pattern = 'foo';
utf8::upgrade($str);
utf8::upgrade($pattern);
my $re = qr/$pattern/i;
my $re_optional = qr/(?i:.?)$pattern/i;
like( $str, $re, "re" );
like( $str, $re_optional, "re_optional" );
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