FIND_NONMEMBER

 The FIND_NONMEMBER function locates the  first  character  in  a
 string  that  is  not a member of a specified set and returns an
 integer value indicating the position of the  character  in  the
 string;  the  function returns 0 if the characters in the string
 were all members of the set.


 Syntax:

    FIND_NONMEMBER( string, char-set )


 The 'string' parameter is a string value, and the 'char-set'  is
 a value of type SET OF CHAR.