What's the criterion?
No digits allowed? Only letters allowed? Punctuation allowed? Spaces allowed?
O positive contains a space
To test for numerics:
where ^anydigit(VAR) ;
To test for non- letters and spaces:
where ^prxmatch('/[^ a-zA-Z]/');
To stop guessing what you really need, please post data you have in usable form and the expected result.
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Learn how use the CAT functions in SAS to join values from multiple variables into a single value.
Find more tutorials on the SAS Users YouTube channel.