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Exclude NULL Values within a Correlation Rule


So According to older threads and support help, I understand that in order to avoid "Null" values in a dashboard search, I should insert "regex($)" expression within the filter.

for example "source user = regex($)" will return only values with data.

I was wondering - how can I implement this logic condition within a correlation rule?

I want my rule will not capture "null" values.

thanks in advance

@pbpillai @lratcliffe 

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