want = catx("-",scan(have,2,"-"),scan(have,1,"-"));
want = catx("-",scan(have,2,"-"),scan(have,1,"-"));
I don't think a solution exists that doesn't separate and combine, at least under the hood. Using prxchange is one way to hide the necessary steps:
want = prxchange('s/(\d+)-(\d+)/$2-$1/', 1, have);
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Learn how use the CAT functions in SAS to join values from multiple variables into a single value.
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