【正则】判断是不是合法的JSON字符串

正则表达式  判断是不是合法的JSON字符串

String regex = "^(?:\".*?\")|(?:true|false|null)|(?:[+-]?(\\d+(?:\\.?\\d*)?|\\d*(?:\\.\\d*))(?:[eE][+-]?\\d+)?)|(?:(?:\\s*\\[\\s*(?:(?:"
      + "(?:\".*?\")|(?:true|false|null)|(?:[+-]?(\\d+(?:\\.?\\d*)?|\\d*(?:\\.\\d*))(?:[eE][+-]?\\d+)?)|(?<json1>(?:\\[.*?\\])|(?:\\{.*?\\})))\\s*,\\s*)*(?:"
      + "(?:\".*?\")|(?:true|false|null)|(?:[+-]?(\\d+(?:\\.?\\d*)?|\\d*(?:\\.\\d*))(?:[eE][+-]?\\d+)?)|(?<json2>(?:\\[.*?\\])|(?:\\{.*?\\})))\\s*\\]\\s*)"
      + "|(?:\\s*\\{\\s*"
      + "(?:\".*?\"\\s*:\\s*(?:(?:\".*?\")|(?:true|false|null)|(?:[+-]?(\\d+(?:\\.?\\d*)?|\\d*(?:\\.\\d*))(?:[eE][+-]?\\d+)?)|(?<json3>(?:\\[.*?\\])|(?:\\{.*?\\})))\\s*,\\s*)*"
      + "(?:\".*?\"\\s*:\\s*(?:(?:\".*?\")|(?:true|false|null)|(?:[+-]?(\\d+(?:\\.?\\d*)?|\\d*(?:\\.\\d*))(?:[eE][+-]?\\d+)?)|(?<json4>(?:\\[.*?\\])|(?:\\{.*?\\}))))\\s*\\}\\s*))$";