java使用正则表达式的方法从json串儿，取想要的value值

例子1：

现有json：

({"code":"200","json":["111"],"message":"true"})

从中提取json的value数据。

直接上代码如下：

import java.util.ArrayList;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class Snippet {
    public static void main(String[] args) {
        ArrayList json = new ArrayList();
        json.add("111");
        User user = new User();
        user.setJson(json);
        user.setCode("200");
        user.setMessage("true");
        String string = "(" + JSON.toJSONString(user) + ")";
        // String regex = ""json":(.*?),"message"";// 使用非贪婪模式！
        Pattern pattern = Pattern.compile("\["(.*?)"\]");
        Matcher matcher = pattern.matcher(string);
        while (matcher.find()) {
            System.out.println(matcher.group(1));
        }
    }
}

例子2：

String str = "我是[001]真心求救的[002]，你能帮帮我吗";

        Pattern pattern = Pattern.compile("\[(.*?)\]");

        Matcher matcher = pattern.matcher(str);

        while(matcher.find()){

            System.out.println(matcher.group(1));

        }

例子3：

public static void main(String[] args) {


String
parse="[{CSTM_NO:"11118",CSTM_NAME:"广东XX电力有限公司",FIX_GNL:"111810158",FIX_ACC:"D201306070003",OP_FLAG:"正常",BUSS_KIND_NAME:"三个月定期存款",BAL:"25,178,750.00",AVAL_BAL:"25,178,750.00",OP_DATE:"2013-06-07",DUE_DATE:"2013-12-07",ROWNUM_:1,idx:0},{CSTM_NO:"11118",CSTM_NAME:"广东XX电力有限公司",FIX_GNL:"111810158",FIX_ACC:"D201306070002",OP_FLAG:"正常",BUSS_KIND_NAME:"三个月定期存款",BAL:"25,178,750.00",AVAL_BAL:"25,178,750.00",OP_DATE:"2013-06-07",DUE_DATE:"2013-12-07",ROWNUM_:3,idx:2},{CSTM_NO:"11118",CSTM_NAME:"广东XX电力有限公司",FIX_GNL:"111810158",FIX_ACC:"D201306070005",OP_FLAG:"正常",BUSS_KIND_NAME:"三个月定期存款",BAL:"25,178,750.00",AVAL_BAL:"25,178,750.00",OP_DATE:"2013-06-07",DUE_DATE:"2013-12-07",ROWNUM_:4,idx:3}]";


String regex="FIX_ACC:(.*?),OP_FLAG";//别忘了使用非贪婪模式！


Matcher matcher=Pattern.compile(regex).matcher(parse);


while(matcher.find())


{


 String ret=matcher.group(1);


  System.out.println(ret);


}


}

总结：(.*?)这个拿出来，左边括号左边是左边界，右边括号右边是右边界，选对后直接匹配，即可拿到