This comment in the sourcecode org.jboss.mq.SpyMessageConsumer
is true.

// Consider removing this test (subscription.accepts). I don't think it
// will ever fail
// because the test is also done by the server before message is even
// sent.
if (subscription.accepts(message.header))

This should also remove the need for gnu-regexp from the client side jars for jbossmq.