我有以下 POST 数据：
dynamicfields=%7B%221%22%3A%7B%22ID%22%3A1%2C%22Name%22%3A%22Email+Address%22%2C%22Value%22%3A%221%40d.com%22%7D%2C%222%22%3A%7B%22ID%22%3A2%2C%22Name%22%3A%22First+Name%22%2C%22Value%22%3A%22coldplay1%22%7D%2C%225%22%3A%7B%22ID%22%3A5%2C%22Name%22%3A%22Contact+No%22%2C%22Value%22%3A%22%22%7D%2C%226%22%3A%7B%22ID%22%3A6%2C%22Name%22%3A%22Gender%22%2C%22Value%22%3A%22Male%22%7D%2C%224%22%3A%7B%22ID%22%3A4%2C%22Name%22%3A%22Date+of+birth%22%2C%22Value%22%3A%2201%2F1%2F2011%22%7D%2C%223%22%3A%7B%22ID%22%3A3%2C%22Name%22%3A%22Last+Name%22%2C%22Value%22%3A%22%22%7D%2C%227%22%3A%7B%22ID%22%3A7%2C%22Name%22%3A%22Country%22%2C%22Value%22%3A%22%22%7D%2C%228%22%3A%7B%22ID%22%3A8%2C%22Name%22%3A%22Unique+Identity+Type%22%2C%22Value%22%3A%22%22%7D%2C%229%22%3A%7B%22ID%22%3A9%2C%22Name%22%3A%22Unique+Identity+Number%22%2C%22Value%22%3A%22%22%7D%7D&f1=1%40d.com&f2=coldplay1&f5=&f6=Male&v6=&month=01&ddlDate=1&v4=&f4=01%2F1%2F2011&f3=&f7=&f8=&f9=&sk=16dcc29ca6320a4583aa32fa0c5035f7eb9a
我必须提取：
&sk=16dcc29ca6320a4583aa32fa0c5035f7eb9a.
的值SK是在每次迭代中不断变化的会话 ID。
尝试使用 RegExtractor 但没有奏效。
正则表达式：&sk=(.*?)或&sk=(.+?)两者都不起作用。