my route in codeigniter does not work for dynamic pages - codeigniter

Question

my page url is
http://example.com/ci/pages/portofolio
My roots in config/routes.php
$route['default_controller'] = "index";
$route['pages/(:any)'] = 'display/display_pages/$1';
$route['404_override'] = '';
My controller in controllers/display.php
class display extends MY_Controller{
function __construct(){
parent::__construct();
}
public function display_pages($seo_name){
echo $seo_name;
}
}
i receive this message
Not Found
The requested URL /ci/pages/portofolio was not found on this server.

Answer 1

Try removing $1 at the end of your route. Make it look like this :
$route['pages/(:any)'] = 'display/display_pages';

Answer 2

Your route.php is correct. The way you are printing the $seo_name is not.
public function display_pages(){
echo $this->uri->segment(3); // it will print $1
}
Check http://ellislab.com/codeigniter/user-guide/libraries/uri.html
The htaccess should be something like
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
#Removes access to the system folder by users.
#Additionally this will allow you to create a System.php controller,
#previously this would not have been possible.
#'system' can be replaced if you have renamed your system folder.
RewriteCond %{REQUEST_URI} ^system.*
RewriteRule ^(.*)$ /index.php?/$1 [L]
#When your application folder isn't in the system folder
#This snippet prevents user access to the application folder
#Submitted by: Fabdrol
#Rename 'application' to your applications folder name.
RewriteCond %{REQUEST_URI} ^application.*
RewriteRule ^(.*)$ /index.php?/$1 [L]
#Checks to see if the user is attempting to access a valid file,
#such as an image or css document, if this isn't true it sends the
#request to index.php
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ index.php?/$1 [L]
</IfModule>
<IfModule !mod_rewrite.c>
# If we don't have mod_rewrite installed, all 404's
# can be sent to index.php, and everything works as normal.
# Submitted by: ElliotHaughin
ErrorDocument 404 /index.php
</IfModule>