Jenkins: run all the jobs matching a regex

runAllJobs.groovy

// This can be executed in the master node script console
Jenkins.instance.getAllItems(AbstractItem.class)
   .findAll {job -> job.fullName.matches("^(a|b).*/master")} 
   .each { job ->

    def actions = [new CauseAction(new Cause.UserIdCause()),  new ParametersAction(new BooleanParameterValue("X", true))] as Action[]
	job.scheduleBuild2(0, actions)
};