Oracle反向字符截取逗號分隔字符串

DECLARE
M VARCHAR(10);
BEGIN
FOR I IN (
WITH T AS
(SELECT REVERSE('i,am,a,test,hahahhah') AS STR FROM DUAL)
SELECT LEVEL,
REGEXP_SUBSTR(T.STR, '[^,]+', 1, LEVEL) STR_SINGLE
FROM T
CONNECT BY LEVEL <= LENGTH(T.STR) - LENGTH(REPLACE(T.STR, ',', '')) + 1)
LOOP
SELECT REVERSE(I.STR_SINGLE) INTO M FROM DUAL;
DBMS_OUTPUT.PUT_LINE(M);
END LOOP;
END;