正则表达式从JSON字符串中提取对象

Question

I have JSON String I would like to extract a Field from it Using Regex. The field can be an Object , Array , String , int or any type. I Know the other way like looping through all the keys in the JSON and finding it. I would like to know, This can be achieved using Regex or not. Any help would be great.

Answer 1

This can be achieved using Regex or not

Not reasonably, no, because regular expressions are not well-suited to interpreting structures like JSON on their own; as with HTML, you want a proper parser.

Instead, use any of the several Java libraries for parsing the JSON and then traversing its content; there's a list of them at the bottom of the JSON site (I see Gson used a lot, but there are lots of options).

Answer 2

It can be achieved through regex, but it is simply worthless, because the you have to parse out your own variables.

Anyway, lets say we have a method getObject(String key, String JSON)

public String getObject(String key, String JSON) {
   Pattern p = Pattern.compile(String.format("\"%s\":\\s*(.*),", key));
   Matcher matcher = pattern.matcher(JSON);
   if(matcher.find())
      return matcher.group();
   return null;
}

Note that this only will find the first occurence, you should modify this to your needs. However, I do recommend a parser which parses the value for you.

Answer 3

最好使用JSON反序列化工具（例如Jackson，GSON），获取对象并检查，