CREATE OR REPLACE TYPE ty_str_split IS TABLE OF VARCHAR2 (4000);

CREATE OR REPLACE FUNCTION fn_var_split (
 p_str IN VARCHAR2,
 p_delimiter IN VARCHAR2
)
 RETURN ty_str_split
IS
 j INT := 0;
 len INT := 0;
 str VARCHAR2 (4000);
 str_split ty_str_split := ty_str_split ();
 v_str VARCHAR2 (4000) := RTRIM (LTRIM (p_str, p_delimiter), p_delimiter);
BEGIN
 len := LENGTH (v_str);

 WHILE len > 0
 LOOP
  j := INSTR (v_str, p_delimiter, 1);

  IF j = 0
  THEN
   str := SUBSTR (v_str, 1);
   len := 0;
   str_split.EXTEND;
   str_split (str_split.COUNT) := str;
  ELSE
   str := SUBSTR (v_str, 1, j - 1);
   v_str := LTRIM (LTRIM (v_str, str), p_delimiter);
   len := LENGTH (v_str);
   str_split.EXTEND;
   str_split (str_split.COUNT) := str;
  END IF;
 END LOOP;

 RETURN str_split;
END fn_var_split;
/

1
12
123
1234
12345 

DECLARE
 CURSOR c
 IS
  SELECT * FROM TABLE (CAST (fn_var_split (';1;12;;123;;;1234;;;;12345;', ';') AS ty_str_split));
 r c%ROWTYPE;
BEGIN
 OPEN c;
 LOOP
  FETCH c INTO r;
  EXIT WHEN c%NOTFOUND;
  DBMS_OUTPUT.put_line (r.column_value);
 END LOOP;
 CLOSE c;
END;
/