public static String removeGroupFromPubSub(String name) {
		if (PUBSUB_NAMED_CHANNEL_PATTERN.matcher(name).find()) {
			return name.substring(name.indexOf(".") + 1);
		}
		else {
			return name;
		}
	}
The prefix for the consumer/producer when creating a topic.
spring-xd-messagebus-spi/src/main/java/org/springframework/xd/dirt/integration/bus/BusUtils.java