[jboss-jira] [JBoss JIRA] (JBRULES-3336) Could not parse knowledge when using 'not contains' in a parentheses leading a '!'

Could not parse knowledge when using 'not contains' in a parentheses leading a '!' ---------------------------------------------------------------------------------- Key: JBRULES-3336 URL: https://issues.jboss.org/browse/JBRULES-3336 Project: Drools Issue Type: Bug Security Level: Public(Everyone can see) Components: drools-compiler (expert) Affects Versions: 5.3.0.Final Environment: jdk 1.6u27 drools 5.3.0 final Reporter: Miles Wen Assignee: Edson Tirelli Labels: notcontains, parentheses This code could not be parsed correctly: rule "out" when Msg(!(set not contains "test")) then end I tried a few simple situations and found that when using 'not contains' operator in a '\!' leading parentheses triggers this problem. If no '\!' prefixing the parentheses,the program works like a charm... The example above seemed so stupid(you can use a 'contains' operator instead), but this is the simplest toy example.And this problem would be looked more important if you want to write some logic like this: Msg(!(set not contains "test" || !bool && string == "hello"))