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php正则截取url中域名后的内容

php程序
需要正则匹配http://或者https://开头,保留域名,截取域名后的内容
比如http://www.baidu.com/aa/bbb中只要http://www.baidu.com把/aa/bbb截取掉


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不用正则也阔以啊,这个不更优雅嘛

$url = 'http://www.baidu.com/aa/bbb';
var_dump(parse_url($url));
//array(3) {
     ["scheme"]=> string(4) "http" 
     ["host"]=> string(13) "www.baidu.com" 
     ["path"]=> string(7) "/aa/bbb"
    }

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