cake php default routing not work
Router::connect('/:lang/:plugins/:controller/:action/*', array('lang' => 'eng', 'controller' => 'index', 'action' => 'index', 'plugin' => null), array('lang' => '[a-z]{3}'));

/           Error: Controller could not be found.
/eng        Error: EngController could not be found.
/eng/pages  Error: EngController could not be found.

<?php
App::uses('AppController', 'Controller');
/**
 * Eng Controller
 *
 */
class EngController extends AppController {

/**
 * Scaffold
 *
 * @var mixed
 */
    public $scaffold;

}