public readonly regExp = new RegExp([
      /(?:def)\s+/, // def
      /(?:self)?\.?/, // self.
      /([a-zA-Z_\u3000-\u303f\u3040-\u309f\u30a0-\u30ff\uff00-\uff9f\u4e00-\u9faf\u3400-\u4dbf][a-zA-Z_0-9\u3000-\u303f\u3040-\u309f\u30a0-\u30ff\uff00-\uff9f\u4e00-\u9faf\u3400-\u4dbf]+[!?=]?|\+|-|\*|\*\*|\/|%|&|\^|>>|<<|==|!=|===|=~|!~|<=>|<|<=|>|>=|\[\]=|\[\]|\+@|-@|!@|~@)?/, // method name
      /(\(.*\)|[^;].*)?/, // method parameters