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custom URL mappings in codeigniter like redmine?
http://demo.redmine.org/projects/<project-name>/controller/action

http://demo.redmine.org/projects/produto/activity
http://demo.redmine.org/projects/produto/issues/new
http://demo.redmine.org/projects/produto/issues/gantt
http://demo.redmine.org/projects/produto/files

// the $1 maps to :any
$route['projects/produto/:any'] = "$1";

// the $1 maps to the first any, $2 maps to the second :any
$route['projects/produto/:any/:any'] = "$1/$2";

public function _remap($method){
if ($method == 'project-name')
{
    //display project1
}
elseif($method == 'project-name2')
{
    //display project2
}

$route['example'] = "controller/function";
$route['example2/(:any)'] = "controller/function";

$route['projects/(:any)/(:any)/(:any)'] = "$2/$3/$1";