title: search for JSON format string in Java file
body: <p>I have a binary file which contains a lot of strings,
  is there any way to find JSON format strings in this file?</p>
  
  <p>If I have encoded this file to one big String in my program, can i use some search engine in Java to find all strings of the form of JSON format?</p>
  
  <p>Is it possible to use Java's pattern matching? if so what regex will be used to describe a recursive data structure like JSON?</p>