url routing in codeigniter

Url Routing in Codeigniter : 


$title = "Here's a string!";
$url_title = url_title($title);


$route['default_controller'] = 'web';

$route['logout']='web/logout';

$route['videos'] = 'web/videos';

$route['videos'] = 'web/videos';

$route['news'] = 'Web/newsAll/';

$route['news-list/(:num)'] = 'Web/news/9'; // news List 

$route['news/(:any)/(:num)'] = 'web/newsDetail/$1/$2';  // new detail 

$route['(:any)/(:num)'] = 'web/page/$1/$2';  //page