java利用正则截取字符串中的数字

     String str = "xxx第47297章33";
        String regex = "\\d*";
        Pattern p = Pattern.compile(regex);

        Matcher m = p.matcher(str);

        while (m.find()) {
            if (!"".equals(m.group()))
                System.out.println("come here:" + m.group());
        }

打印结果为

come here:47297
come here:33