Hello, Monks!

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. I can do this with a one-liner, but there's got to be a better way to do this.

I've looked at regexes, and map, but I can't figure out anything really clean and fast.

Given input data like 

9b/lllqtUst48MMMxwBHz+wluFguNx5h3DnyKxfxFjNazwc0X
9b/lllqtxTElC8GLsftS2RKkAxI1MfQTIuNx5h3P4eoEphA31djsn
9b/lllqtyk/lC8MMMxwwwhcTAxlhNBl1ugoluNx5h3fjxud309RVeCIY
9b/lllqtcxP8MMMxBvFfOh8lLxQTfguNx5h3LKrE0maElw
9b/lllqtdx48MMMxw6h4+mol1ugoluNx5h3AKrdGQ9OCnW
9b/lllqtf2l48MMMxDxaxxz29OAHIuNx5h3wG2TEyFqu3RdBin
9b/lllqthPElC8MMMxw78QQ0bfaPlI14TfguNx5h30beTAmP1cfA+Z
9b/lllqtryA8GL2m2s9OQrxzotuIuNx5h3MUw/45uzMeC5ww

[download]

and this one-liner: 

perl -lne 'chomp; undef %h; @p=split(//,$_); foreach $k (@p) { $h{$k}=
+$k; } print (sort keys(%h));' test-strings

[download]

I get these correct results: 

+/034589BDFHKMNUXabcfghjlnqstuwxyz
/1234589ACEGIKLMNPQRSTbdefhjklnopqstux
/013589ABCIMNRTVYbcdefghjkloqtuwxy
/03589BEFKLMNOPQTabcfghlmqrtuvwx
+/1345689ACGKMNOQWbdghlmnoqrtuwx
/234589ABDEFGHIMNORTabdfhilnqtuwxyz
+/01345789ACEIMNPQTZabcefghlmqtuwx
/234589ACGILMNOQUbehlmoqrstuwxyz

[download]

Any pointers are appreciated! Thanks!

Update: Got it, thanks! But the golfing has commenced...

In reply to Collapsing a string to unique characters by dwhite20899

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