[rules-users] Need Syntax help for a string match

Need to do some tasks if customers age is in 18,21,33,28,40,41. Can't use contains as age is a string value.Could any one help me out. Below rule does not work. rule "Age Factor" when m : Customer( age matches "18,21,33,28,40,41") then System.out.println("Customer falls in age group "); doAgeTasks(); end Thanks, Lindy.