I know this is a late response to thread, but finally got this working for myself as well. Here is a sample input:
[WinEventLog://Microsoft-Windows-GroupPolicy/Operational]
renderXml= True
#client-side extension processing started/completed
whitelist1 = EventCode=%^(4016|5016)$%
#gpo download from domain controller
whitelist2 = EventCode=%^(5126)$%
#manual processing of GPO started/completed for user
whitelist3 = EventCode=%^(4004|8004)$%
#manual processing of GPO started/completed for machine
whitelist4 = EventCode=%^(4005|8005)$%
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