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Only select rows where the first character of the contained string is a number, not a letter

How can I use JSL to only select rows that contain a string that begins with a number, while ignoring strings that begin with a letter?

Re: Only select rows where the first character of the contained string is a number, not a letter

There are several ways to do this. Here are two examples. 

 

dt << select where(!Is Missing(Num(Left(:data[], 1))));

dt << select where(!Is Missing(Regex(Left(:data[], 1), "^\d")));