关于正则，求好手帮助

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
[解决办法]

$s=<<<txt
http://bbs.csdn.net/topics/new?forum_id=PHP
http://www.bdyy.cc/detail/?20236.html
http://www.qq.com/html/?20236.html?id=88888
txt;
preg_match_all('/http:\/\/([^\/]+)\//s',$s,$matches);
print_r($matches[1]);

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

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