klein.php subdomain matching

anotherroute.php

<?php
$this->respond(
         '/?', function ($req, $res, $service, $app) {
		return "home page for SUBDOMAIN";
		}
    );

index.php

<?php
//this is what i changed my code to after seeing this issue: https://github.com/klein/klein.php/issues/245
//see index_original.php for my original code
$klein = new \Klein\Klein();
$routesites = array();
$routesites["/^example\.com/"] = "someroute.php";
$routesites["/^sub\.example\.com/"] = "anotherroute.php";
$routesites["error"] = "route404.php";

$host = $_SERVER["HTTP_HOST"];
$route = $routesites["error"];
foreach($routesites as $match=>$route_){
	if($match == "error") continue; //skip the error route
	if(preg_match($match, $host)){
		$route = $route_;
		break;
	}
}
$klein->with("/?", $route);
$klein->dispatch();

index_original.php

<?php
//This is my original version of the code
$klein = new \Klein\Klein();
$routesites = array();
$routesites["example.com"] = "someroute.php";
$routesites["hello.example.com"] = "anotherroute.php";
$routesites["error"] = "route404.php";

$host = $_SERVER["HTTP_HOST"];
$route;
if(($route = $routesites[$host]) == false){
$route = "error";
}
$klein->with("/?", $route);
$klein->dispatch();

route404.php

<?php
$this->respond(function ($req, $res, $service, $app) {
	echo "i think you are lost";
	exit;
});

someroute.php

<?php
$this->respond(
         '/?', function ($req, $res, $service, $app) {
		return "home page for main site";
		}
    );