[rules-users] Error using multiple evals

[Ayush]

Hi, I even tried using below approach

AlertReceivedEvent() over window:time(1m) from entry-point
NotificationStream
               
                $I1 : Double() from getIsgNodeCount()
               
                Number(doubleValue > $I1) from accumulate(
                        AlertReceivedEvent(
                                entity == "NPMMS_NE_CONNECT",
                                probableCause == 3,
                                eval((specificProblems matches ("REPT ISG
NPMMS::Unable to connect to "+getPxmmsNameRegex()+" node: PXMMS")) == true)
                        ) over window:time(1m) from entry-point
NotificationStream, count()
                )

But when I'm placing parentheses () around it, it throws exception stating
mismatched input '$I1' expecting ')' in rule . I don't want to put these 3
statements (mentioned in the above port) in separate rules. Can anyone
please help me solving it? Thanks in advance. 
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