最近用PHP做网页抓取的项目，遇到了个问题，就是对方返回的是一个大的字符串，我需要从这个字符串中提取我想要的内容，下面列出我的两个解决方案。

问题：从如下字符串中：

var js={futures:["AU14061,AU1406,沪黄金06,267.65,265.45,264.95,267.00,263.50,97611,367844,0.00,280.56,253.84,267.60,180786,-2.65,-0.99%,
265.36,122,191529,175999,1,264.75,264.80,2014-03-20 11:29:59,1"],
extendedFutures:["264.80,200|264.75,300","11:30:02,-42,7,1|11:29:52,28,-6,1
|11:29:32,264.90,158,-1,-2,4,-1|11:29:22,66,-10,-1|
11:29:02,32,22,3,1|11:28:52,146,2,1|11:28:32,292,-24,-1|
11:28:22,264.85,40,-1|11:28:02,144,-30,-1|11:27:52,44,10,1|
11:27:32,142,-20,1|11:27:22,-8,-1|
11:27:02,5,-1|11:26:52,24,8,1|
11:26:32,6,-1|11:26:22,0|11:26:02,240,-78,-1|

11:25:32,12,0|11:25:22,0|11:25:02,

1|11:24:52,1|11:24:32,

264.80,38,1|11:24:22,62,-1|11:24:02,30,

-1|11:23:52,1"]}

提取出futures 后的[]的内容，并转换成数组。

解决方案一：

$str = explode('"],extended',substr($f,18));
array = explode(",",$str[0]);
var_dump( $str );

输出结果为：

方案二：

利用正则表达式，先查到目标子串，然后用分割的办法，得到数组。

preg_match('/(?<=\[\")([^\]]*?)(?=\"\])/',$f,$m);
var_dump( explode(',',$m[1]) );

输出结果同上