String Tokenizer

Query to tokenize comma seperated string:

SELECT TRIM(SUBSTR( txt
                   ,INSTR(txt, ',', 1, level ) + 1
                   ,INSTR(txt, ',', 1, level+1) - INSTR(txt, ',', 1, level) - 1
                  )
           ) AS token
  FROM (SELECT ',' 'Comma,Seperated,String' ',' AS txt FROM DUAL )
CONNECT BY level <= LENGTH(txt) - LENGTH(REPLACE(txt,',','')) - 1;

Output:

TOKEN
------
Comma
Seperated
String