String readString() {
            char quoate = ch;
            next();

            int beginIndex = pos - 1;
            while (ch != quoate && !isEOF()) {
                next();
            }

            String strValue = path.substring(beginIndex, isEOF() ? pos : pos - 1);

            accept(quoate);

            return strValue;
        }
@since 1.2.51
@param json
@param path
@return
src/main/java/com/alibaba/fastjson/JSONPath.java