Is the string AlphaNumeric (A..Z, a..z, 0..9) ?
The string to evaluate
xf.Str.StringIsAlphaNumeric("VarName") => True
xf.Str.StringIsAlphaNumeric("Testing123") => True
xf.Str.StringIsAlphaNumeric("Testing 123") => False
xf.Str.StringIsAlphaNumeric("134.33") => False