[Forums] Filter by "Not Like" in Aggregate

I am able to filter by "like" in an aggregate.  This statement works:
AuditRequest.Attribute like "%Id%"

I am not able to use "not like".  This statement causes an "Unexpected 'not' in expression" error:
AuditRequest.Attribute not like "%Id%"

What syntax should I use in an aggregate to filter by not like?

Thanks.