Finding duplicates in a column with multiple product #'s

Hi,
Is there a way to find duplicates when a column may contain multiple product numbers which are comma separated? I was able to get the below formula to flag red when only one event number is duplicated in a one to one ratio, and also have the formula disregard blanks. Any ideas if there is a way to find duplicates when your data is comma separated?
=IF([Event #]1 = 0, 0, IF(COUNTIF([Event #]:[Event #], [Event #1) > 1, 1))
Example of the data
EVENT #
Event001
Event001, Event003
Event002
Event003, Event 001
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Comments
You would want to replace the criteria portion of your COUNTIF with a FIND function.
COUNTIFS([Event #]:[Event #], FIND([Event #]1, @cell) > 0)
thinkspi.com
You are a lifesaver! Thanks Paul!!