java提取字符串的正则表达式

数据格式：
{"collectTime":"2015-11-11 10:08:27","dateTime":"1447207707612,"hostName":"SW-ADMIN-S5750-A0102","instanceId":"26054","metricId":"outDiscardsRate","metricName":"发送丢包率","metricValue":0,"resourceId":"RuijieSwitch","sonInstanceId":"","sonInstanceName":""}

目前匹配两个","之前的可以Pattern p = Pattern.compile("(.*?,){2}");
匹配一个","之后的也可以Pattern p = Pattern.compile("(?<=((.*,))).*");

​匹配两个","之后的Pattern p = Pattern.compile("(?<=((.*,){2})).*"); 这样会报错
怎么匹配两个","之后的内容呢？

Java code

public static void main(String[] args) {
String source = "first {test} is here,two {test2} is here!";
String find = "\u007B.*\u007D";
Pattern pattern = Pattern.co......
答案就在这里：java 正则表达式 提取字符串
----------------------Hi，地球人，我是问答机器人小S，上面的内容就是我狂拽酷炫叼炸天的答案，除了赞同，你还有别的选择吗？

Pattern p = Pattern.compile("(?<=((.*?,){2})).*");

加上一个问号