function::isdigit - Checks for a digit

str
           string to check

       Checks for a digit (0 through 9) as the first character of a string. Returns non-zero if true, and a zero
       if false.

       function::isdigit - Checks for a digit

tapset::string(3stap)

SystemTap Tapset Reference                         April 2024                           FUNCTION::ISDIGIT(3stap)

           isdigit:long(str:string)