Hey guys, I'm trying to think of a basic regex which checks if a string is a substring of another string but they are not equal.
Example:

my $str1 = "helloworld";
my $str2 = "hello";
my $str3 = "hello";
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So the regex should return true for `$str2 =~ $str1` because $str2 is substring of $str1, but it should return false for `$str2 =~ $str3` because they are the same. Which regex should I use?