Re^6: compare two strings and return only he unique values.

[Kenosis]

Yes--I do understand, and your code works perfectly well for that initial case. Then the OP shows the following case:

my $string1="ABCDE";
my $string2="BBBBB";

Had the OP used $string2="FFFFF";, your code would not show "F", even though--after a string comparison--"F" is unique to $string2.

I see many good minds working on this issue with different POVs. Again, I think it evidences that the specs are equivocal.

BTW - I didn't downvote yours or others' similar interpretation of "unique;" I merely commented on it.

[blue_cowdawg]

your code would not show "F"

Did you actually try the code? I did. Depending on your definition of unique there are ways of tweeking that code so that I show each letter exactly once. Or I could show you the letters that are seen more than once. Or only once.

[Kenosis]

Did you actually try the code?

Yes.

Depending on your definition of unique...

Exactly my point. And our discussion is precisely about the definition. Am quite puzzled by the downvotes in our dialogs' postings...