比如域名是alixixi.com,正则表达式如下：
$S = 'http://www.alixixi.com/'
$domain = array('com','cn','name','org','net');
$SS = $S;
$dd = implode('|',$domain);
$SS = preg_replace('/(.*)((\w+)(\.('.$dd.'))*\.('.$dd.'))$/iU','$2',$SS);
echo $SS ;
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