The PowerBuilder Foundation Classes have a number of of_isXXXX methods (e.g., of_isalpha, of_isalphanum) in the pfc_n_cst_string object. You could use a slight variation of it to create an of_isnum function:
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The PowerBuilder Foundation Classes have a number of of_isXXXX methods (e.g., of_isalpha, of_isalphanum) in the pfc_n_cst_string object. You could use a slight variation of it to create an of_isnum function: