Regular expression not working properly in JON Alert Conditions

Issue

• We configured the alerts with alert condition as below

  Event Severity as "DEBUG" and matching expression as "[2010002].+[CLEAR]"
  

• It should create an alert on below matching string in an event

  "DEBUG [2010002] [7] [CLEAR] [2011-08-11 20:34:54] [POP-ESB] [CustomExceptionHandlerAction:ValidateSourceProxy] [172.18.2.36]"
  

• But on occurrence of above event, it is not creating an alert.

• Can you see whether this is an issue in JON or my regular expression is wrong. I am tring to match below string