Method isbnGs1

src/main/java/com/github/javafaker/Code.java:26–28

This can be overridden by specifying code: isbn_gs1: "some expression" in the appropriate yml file. @return a GS1 code for an ISBN13, currently is only 978 and 979

()

     * @return a GS1 code for an ISBN13, currently is only 978 and 979
     */
    public String isbnGs1() {
        return faker.regexify("978|979");
    }
    /**
     * This can be overridden by specifying
     * <code>