Router string parameter for search controller

I am creating a generic search for my app and am trying to use "router" to generate something like "/search/anything+here" I'm doing it this way:

$di->set('router', function(){
  $router = new \Phalcon\Mvc\Router();
  $router->add(
    "/search/{term:[a-zA-Z_]+}",
    array(
      "controller" => "search",
      "action"  => "search",
    )
  );

  return $router;
});

In SearchController I try this

    public function searchAction()
    {
      $term = $this->dispatcher->getParam("term");
      $this->log->log($term);
    }

Thus I can only get the parameter {term} if only with a simple word like "anything" if I use "anything+here" or "anything here" the router is ignored.

I do not know if I was clear on the issue.