Oracle 10g SQL - Parsing Delimited String

Vikram Vaidyanathan <[email protected]> Tue, 10 Jan 2012 13:24:54 -0800 (PST)

Newsgroups	gmane.comp.db.oracle.toad.free
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I need to write a generic SQL query to parse a comma delimited string from right to left and return the first non-null value.
 
Example: 
1.  ,,,Database,,10g,,Oracle,,
2.  ,,10g,,,Oracle,,,,,,
3.  ,,,Data,,,Menu,,,Oracle,,,
 
For all the above examples, the output should be "Oracle" 
 
Appreciate the help.
 
Thanks,
Vikram