ZF2 Routing Confusion

Question

I am sure the answer to this is obvious, but it is eluding me right now. I have the following code in my module.config.php

'subdomain' => array(
    'type' => 'Hostname',
    'options'=> array(
        'route' => ':subdomain.mydomain.com',
        'defaults' => array(
            'controller' => 'Application\Controller\Index',
            'action'    => 'foo',
        ),
    ),
    'child_routes' => array(
        'withcontroller' => array(
            'type' => 'Segment',
            'options' => array(
                'route' => '[/:controller/:action]',
                'constraints' => array(
                    'controller' => '[a-zA-Z][a-zA-Z0-9_-]*',
                    'action'     => '[a-zA-Z][a-zA-Z0-9_-]*',
                ),
                'defaults' => array(),
             ),
         ),

If I remove the child_routes, test.mydomain.com is matched no problem. When I add the child_routes section, test.mydomain.com/Index/foo is matched, but test.mydomain.com is not matched. I thought that the square parentheses around /:controller/:action would make those parameters optional. What am I misunderstanding here?

Answer 1

Okay, found the solution, not sure why, but moving the slash from :controller outside the paran's makes everything work fine.