Findb nonum

Type Function: INT

Input STR	STRING (String input)
Output	INT (position of the last letter that is not a number)
	The function FINDB_NONUM STR searches from right to left and returns the last position which is not a number.
	Numbers are the letters "0..9" and "."

Example:

FINDB_NONUM('4+33+1') = 5