CodeIgniter Routing related issues

CodeIgniter Routing problems
I'm not familiar with CodeIgniter. This is especially the way to route this piece. Now change to a system. Write the controller after the access always appears "Route_error" error;

For example, I wrote a login.php controller placed in the Controllers/admin directory, I directly access Www.abc.com/admin/login will appear "Route_error." Error.
If I add a line to route.php:
$route [' admin ']= "admin/login";
That's all you can do. But too much trouble, I can not write a controller to modify the route.php it?!

Here is my route.php file. Do not understand what the previous meaning, we help to see how to set up I can normally write my controller without affecting the previous use:

$route [' default_controller '] = "welcome";
$route [' scaffolding_trigger '] = "";

name-of-school/class-of/firstname-lastinitial/photo-albums/album-name/upload/
$route [' ([A-za-z0-9\-_]+)/([A-za-z0-9\-_]+)/([A-za-z0-9\-_]+)/(Video|photo) \-([A-za-z0-9\-_]+)/([A-za-z0-9\-_] +)/([A-za-z0-9\-_]+) (/([a-za-z0-9\-_]+)) * '] = "user/$4_$5/$7/$8";

$route [' ([a-za-z0-9\-_]+)/school_admin/([a-za-z0-9\-_]+)/([a-za-z0-9\-_]+)/([a-za-z0-9\-_]+] (/([a-za-z0-9\-_]+ )) * '] = "school_admin/$3/$4$5";

$route [' ([a-za-z0-9\-_]+)/group_admin/([a-za-z0-9\-_]+)/([a-za-z0-9\-_]+)/([a-za-z0-9\-_]+] (/([a-za-z0-9\-_]+) ) * '] = "group_admin/$3/$4$5";


name-of-school/class-of/firstname-lastinitial/games/game-name/
$route [' ([a-za-z0-9\-_]+)/([a-za-z0-9\-_]+)/([a-za-z0-9\-_]+)/([a-za-z0-9\-_]+)/([a-za-z0-9\-_]+] (/([a-za-z0-9 \-_]+)) * '] = "user/$4/$5/$6";


Logout
$route [' (logout|login|register) '] = "member/$1";

404
$route [' (games|video-albums|photo-albums|group|admin|groupadmin|yearbook|settings) (/.*) * '] = "error";


------Solution--------------------
Www.abc.com/index.php/admin/login
------Solution--------------------
queryphp Frame routing can use the name


Other settings can add your own defined routing rules:
C ("router")->rulemaps (' logout ', '/logout ', Array (' controller ' = ' auth ', ' action ' = ' logout '));
C ("router")->rulemaps (' Signup ', '/signup ', Array (' controller ' = ' auth ', ' action ' = ' signup '));
C ("router")->rulemaps (' profile ', '/profile/:action ', Array (' controller ' = ' profile ')); Would call controller ' profile ' with dynamic method ': Action () '
C ("router")->rulemaps (' Users ', '/users/:id ', Array (' controller ' = ' users '), array (' id ' = ' = ' [\d]{1,8} ')]; Define filters for the URL parameters


Http://code.google.com/p/queryphp/downloads/list

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