my $target_name = 'the quick brown fox';
$_ = 'the quick brown fox jumps over the lazy dog';
if ($_ !=~ [$target_name]) { print 'ok' }

Argument "�›¡¡�›ª╫╧ç╬╩Ü₧╠╞╧╓" isn't numeric in numeric ne (!=) at ...
Argument "the quick brown fox jumps over the lazy dog" isn't numeric in numeric ne (!=) at ...