$str = "http://www.baidu/.com?url=www.sina.com/";
preg_match("/http:(.*)com/", $str, $matches);
print_r($matches);
Array ( [0] => http://www.baidu/.com?url=www.sina.com [1] => //www.baidu/.com?url=www.sina. )
$str = "<a http://www.baidu/.com?url=www.sina.com/";
preg_match("/http:(.*?)com/", $str, $matches);
print_r($matches);
Array ( [0] => http://www.baidu/.com [1] => //www.baidu/. )
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原文地址：http://blog.csdn.net/u011252402/article/details/47122451
