[rules-users] before/after behavior for negative pattern

[Rob21]

Also, with the "before" keyword in place of "after", the problem is
different, it considers all events as the start event.

rule "Detect it"
when
    $start : RawEvent()
    not $re : RawEvent(eval($re != $start), id == $start.id, this
before[0ms, 90s] $start)
then
    System.out.println("detected: " + $start);
end



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