Zend框架为什么这个带有西班牙语字符的url不起作用

当我以http://www.example.com/Formación的身份访问url时那么路由应该匹配，但它不起作用，因为我有一个字符ó，如何使这个ó西班牙语字符与ZF中的以下路由兼容？

$route = Http'Segment::factory(array(
  'route' => '/Formación',  //<<<<< this character must be used: ó
  'defaults' => array(
    'controller' => 'Application'Controller'Trainingsignup',
    'action' => 'index'
  ),
));
$router->addRoute('traininges', $route, null); 

EDIT：跟随失败

  'constraints' => array(
      'controller' => '[a-zA-ZóäöüÄÖÜß][a-zA-ZóäöüÄÖÜß0-9_-]+',
      'action'     => '[a-zA-ZóäöüÄÖÜß][a-zA-ZóäöüÄÖÜß0-9_-]+',
  ),   

EDIT：跟随失败

  'constraints' => array(
      'controller' => '/^'p{L}['p{L} _.-]+$/u',   //or /['p{L}]+/u
      'action'     => '/^'p{L}['p{L} _.-]+$/u',   //or /['p{L}]+/u
  ),