Where am I? You need to setup your server names in class.config.php $_SERVER['HTTP_HOST'] reported

昨天部署一个从GitHub上下载的php框架：Simple-PHP-Framework。部署到Apache上时报错了，错误如下：

Where am I?

You need to setup your server names in class.config.php

$_SERVER['HTTP_HOST'] reported localhost

在网上找了好久，大概是知道要给Server name一个值，所有就在下面这段代码的$localServers赋值。

 class Config
    {
        // Singleton object. Leave $me alone.
        private static $me;


        // Add your server hostnames to the appropriate arrays. ($_SERVER['HTTP_HOST'])
        // Each array item should be a regular expression. This gives you the option to detect a whole range
        // of server names if needed. Otherwise, you can simply detect a single server like '/^servername\.com$/'
        private $productionServers = array('/^your-domain\.com$/');
        private $stagingServers    = array();
        private $localServers      = array();

我是这样写的：private $localServers      = array('localhost'); 结果又报错了，错误如下：

Warning: preg_match() [function.preg-match]: Delimiter must not be alphanumeric or backslash in D:\Program Files\wamp\www\simple-php-framework-master\includes\class.config.php on line174

搞得好郁闷，早上问leader他没有及时过来帮我解决，我又是PHP新手，搞得都没有继续学习的兴趣，到下午他来帮我看时看了一下，结果解决方案和我的一样，看到上面的报错后又改成下面这样，就可以了：

private $localServers      = array('/localhost/');

其中原理搞得不太清楚。给像我一样的新手参考一下。