we could shorten it a little
DECLARE
mystr VARCHAR2 (1000) := '00AF 00F3';
mychar CHAR (1);
total NUMBER (10) := 0;
BEGIN
FOR i IN 1 .. LENGTH (mystr)
LOOP
mychar := SUBSTR (mystr, i, 1);
CASE
when instr('1248',mychar) !=0 then total := total +1;
when instr('3569AC',mychar) !=0 then total := total +2;
when instr('7BDE',mychar) !=0 then total := total +3;
when instr('F',mychar) !=0 then total := total +4;
ELSE NULL;
END CASE;
END LOOP;
dbms_output.put_line(to_char(total));
END;
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