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not real sure what you want - if you want to know they are different in code -several ways to
if($str[71] == $str[96]) { your code if they are the same }
else { echo '"$str[71]" does not equal "$str[96]"';}
Ok I figured out the problem - I was using regex to populate the variables that were passed via the form. The regex had an error and unwanted characters were being matched, I fixed the regex and now it works.