Re: [rules-users] Simple rule worked in 4.0.7 and failed in 5.0.1

I added a comment to the JIRA, but replicate it here for completeness: ===== Due to some limitations on the way that Drools 4 handles regexps, we had to change the default escaping syntax for regexps, from single escape to double escape. In Drools 5, regexps work exactly like in Java. So, instead of doing: ".*\s(ADDR)\s.*|(ADDR)\s.*|.*\s(ADDR)" You need to write: ".*\\s(ADDR)\\s.*|(ADDR)\\s.*|.*\\s(ADDR)" If you would like to continue using regexps in the same way you did for Drools 4, i.e., with single escape (not recommended), there is a configuration that makes Drools 5 parse regexps as it did in Drools 4. Using the type safe API, you can do: KnowledgeBuilderConfiguration config = KnowledgeBuilderFactory.newKnowledgeBuilderConfiguration(); config.setOption( ProcessStringEscapesOption.NO); KnowledgeBuider kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder( conf ); If you prefer to use the property or configuration file, then it is: drools.parser.processStringEscapes = false ======= []s Edson 2009/6/25 Corneil du Plessis <corneil(a)tsctech.com&gt; -- Edson Tirelli JBoss Drools Core Development JBoss by Red Hat @ www.jboss.com