How to add a Restful controller in a Zend module - rest

Question

I'm actually working on a zend framework 2 application which should render two sorts of View :
a view model
a json model
I would include the restful controller in my module but I don't understand if it's possible or recommended.
If someone has been already confronted to a same case, does he could bring me some explanations because I'm searching an answer since 2 days fruitlessly.
In my module.config.php I have :
return array(
'controllers' => array(
'invokables' => array(
'Role\Controller\Role' => 'Role\Controller\RoleController',
'Role\Controller\RoleRest' => 'Role\Controller\RoleRestController',
),
),
'router' => array(
'routes' => array(
'role' => array(
'type' => 'segment',
'options' => array(
'route' => '/role[/:action][/:id]',
'constraints' => array(
'action' => '[a-zA-Z][a-zA-Z0-9_-]*',
'id' => '[a-zA-Z][a-zA-Z0-9_-]*',
),
'defaults' => array(
'controller' => 'Role\Controller\Role',
'action' => 'index',
),
),
),
'role-rest' => array(
'type' => 'segment',
'options' => array(
'route' => '/role-rest[/:id]',
'constraints' => array(
'id' => '[a-zA-Z][a-zA-Z0-9_-]*',
),
'defaults' => array(
'controller' => 'Role\Controller\RoleRest',
'action' => 'getList',
),
),
),
),
),
'view_manager' => array(
'strategies' => array(
'ViewJsonStrategy',
),
'template_path_stack' => array(
'role' => __DIR__ . '/../view',
),
),
);
and when i try to get myApplication.localhost/role-rest, the page displays the following message :
"The requested controller was unable to dispatch the request.
Controller:
Role\Controller\RoleRest"
I resolve the problem with a simple change in the id's regex constraint :
'constraints' => array(
'id' => '[a-zA-Z0-9_-]*',
),