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

[#1]

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?

[#2 · Accepted solution]

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")));