No good. Hash keys are unordered.
So? The OP didn't make it a requirement the result was ordered:
I have a number of strings, made up only of 64 characters: a-zA-Z0-9/+ . I need to collapse these down to just the unique characters in the string.

Besides, Perlmonks has a long tradition of making small changes to the requirements for the sake of winning at golf. ;-)

In reply to Re^3: Collapsing a string to unique characters by JavaFan
in thread Collapsing a string to unique characters by dwhite20899

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