求一段正则表达式,该怎么处理

   $str=<<
  

  
  
  
[淘宝商城]
  
活动标题
  
  
  

  ……
  

……


html;
preg_match_all('#]*>(.*)#isU',$str,$arr);
foreach($arr[1] as $v){
     preg_match_all('#]*>(.*)#isU',$v,$ar[]);
}
print_r($ar);

------解决方案--------------------

PHP code

$str = <<
  

  
  
  
[淘宝商城1]
  
活动标题
  
  

  
  
  
[淘宝商城2]
  
活动标题
  

HTML;
/**
 *"shopname" => "淘宝商城",
  "activename"=> "活动标题",
  "actimage" => "http://image.com/pic.gif", 
  "acturl" => "http:/www.tmall.com/" //这个是活动标题的链接
 */

$pattern = '~img.*(?<=")(.*)".*\[(.*)\].*(?<=f=")(.*)".*(?<=e=")(.*)"~Uis';
preg_match_all($pattern, $str, $m);

$res = array();
$num = 4;//匹配项数量
for ($i = 0; $i < count($m[0]); $i++){
    for ($j = 1; $j <= $num; $j++){
        $res[$i][] = $m[$j][$i];
    }
}
echo '
';
print_r($res);
echo '
';
/**
剩下的你懂的
Array
(
    [0] => Array
        (
            [0] => http://image.com/pic.gif1
            [1] => 淘宝商城1
            [2] => http://www.tmall.com/1
            [3] => 活动标题1
        )

    [1] => Array
        (
            [0] => http://image.com/pic.gif2
            [1] => 淘宝商城2
            [2] => http://www.tmall.com/2
            [3] => 活动标题2
        )

)
*/