求一个URL的正则

Question

http:\/\/lrd.yahooapis.com\/_ylc=X3oDMTVjaGdkOGVmBF9TAzIwMjMxNTI3MDIEYXBwaWQDTEVoNUxhVFYzNEZKNl81bzh2R2llcWR1RlQyNkhqYm55WW13WTVnQVBWeWdsV21iQmZwSVN0XzVubU1PTTBIMUdiZkwEY2xpZW50A2Jvc3MEc2VydmljZQNCT1NTBHNsawN0aXRsZQRzcmNwdmlkA1NMbm0zV0tJY3JySklWTzBTZEQ3WkZ0dVR3dm10MDF4Z2I0QUF1dVE-\/SIG=10nolt70f\/**http%3A\/\/jquery.com%3Fx=0http:\/\/lrd.yahooapis.com\/_ylc=X3oDMTVjaGdkOGVmBF9TAzIwMjMxNTI3MDIEYXBwaWQDTEVoNUxhVFYzNEZKNl81bzh2R2llcWR1RlQyNkhqYm55WW13WTVnQVBWeWdsV21iQmZwSVN0XzVubU1PTTBIMUdiZkwEY2xpZW50A2Jvc3MEc2VydmljZQNCT1NTBHNsawN0aXRsZQRzcmNwdmlkA1NMbm0zV0tJY3JySklWTzBTZEQ3WkZ0dVR3dm10MDF4Z2I0QUF1dVE-\/SIG=118du27i5\/**http%3A\/\/en.wikipedia.org\/wiki\/JQuery%3Fx=0
                
有许多这样的地址，如何去掉yahoo的前缀验证地址，正则出网站的真实地址？ 即 两个星号 ** 后面， %3Fx=0 前面的那段地址？
谢谢。                

Answer 1

$str = <<<eof
http:\/\/lrd.yahooapis.com\/_ylc=X3oDMTVjaGdkOGVmBF9TAzIwMjMxNTI3MDIEYXBwaWQDTEVoNUxhVFYzNEZKNl81bzh2R2llcWR1RlQyNkhqYm55WW13WTVnQVBWeWdsV21iQmZwSVN0XzVubU1PTTBIMUdiZkwEY2xpZW50A2Jvc3MEc2VydmljZQNCT1NTBHNsawN0aXRsZQRzcmNwdmlkA1NMbm0zV0tJY3JySklWTzBTZEQ3WkZ0dVR3dm10MDF4Z2I0QUF1dVE-\/SIG=10nolt70f\/**http%3A\/\/jquery.com%3Fx=0 http:\/\/lrd.yahooapis.com\/_ylc=X3oDMTVjaGdkOGVmBF9TAzIwMjMxNTI3MDIEYXBwaWQDTEVoNUxhVFYzNEZKNl81bzh2R2llcWR1RlQyNkhqYm55WW13WTVnQVBWeWdsV21iQmZwSVN0XzVubU1PTTBIMUdiZkwEY2xpZW50A2Jvc3MEc2VydmljZQNCT1NTBHNsawN0aXRsZQRzcmNwdmlkA1NMbm0zV0tJY3JySklWTzBTZEQ3WkZ0dVR3dm10MDF4Z2I0QUF1dVE-\/SIG=118du27i5\/**http%3A\/\/en.wikipedia.org\/wiki\/JQuery%3Fx=0
eof;
$reg="/(?<=\*\*)(.*?)(?=%3Fx\=0)/is";
preg_match_all($reg,$str,$arr);
foreach($arr[1] as $v){
  echo urldecode(stripcslashes($v)) . "<br>";
}