关于正则，求高手帮助

如例:
http://bbs.csdn.net/topics/new?forum_id=PHP
http://www.bdyy.cc/detail/?20236.html
http://www.qq.com/html/?20236.html?id=88888

preg_match('/(http:\/\/)(.*)(\/)/',$rrr,$matches);

如何分别正则出:
bbs.csdn.net
www.bdyy.cc
www.qq.com

回复讨论(解决方案)

$s=<<  
 Array  
 (  
     [0] => bbs.csdn.net  
     [1] => www.bdyy.cc  
     [2] => www.qq.com  
 ) 
 
   preg_match('/http:\/\/([^\/]*)/i',$rrr,$matches);