配置文件中：

"URL_ROUTER_ON"=>true,
//规则路由 和正则路由
"URL_ROUTE_RULES"=>array(
"/^i_(\d+)$/"=>"Home/Index2/index?id=:1",
"/^a_(\d+)$/"=>"Home/Index2/add?id=:1",
"/^e_(\d+)$/"=>"Home/Index2/edit?id=:1",
),

控制器中：
public function index(){
echo I("id");
$this->assign("id",I('id'));
$this->display();
}
public function add(){
echo I("id");
$this->assign("id",I('id'));
$this->display();
}

public function edit(){
echo I("id");
$this->assign("id",I('id'));
$this->display();
}

模板中：
<a href="{:U('/a_$id')}"> 点击链接add</a><br/>

可是$id 不能解析 ，求指点