正则匹配<{$vcode}>变量

$title="<{t}>您的验证码是：<{/t}><{$vcode}>，<{t}>请在注册页输入验证码并完成注册；验证码<{$vcode2}>有效期24小时<{/t}>";

if($data!=""){
    preg_match_all('/<{$(S+)}>/iU', $title, $result);

    foreach($result[1] as $k => $v){
       $v=explode('.',$v);
       $data=$tmpArr;

       foreach($v as $key => $val){

             $data=$data[$val];

             if(is_array($data))
             continue ;
             else{

                 $title = str_replace($result[0][$k],$data,$title);

             }

         }
     }

 }