CXFRS doesn't work when there are multiple optional parameters in a @Path annotation

In JAX-RS you can define custom patterns for path variables, which allows you to define optional parameters that can be present or not. Currently, CXF only works if you only have 1 optional parameter in the @Path (see test "URITemplateTest.testExpressionWithNestedGroupAndTwoVars2()", but fails for paths with 2 or more optional parameters.