java 判断字符串是不是以数字开头

    //判断字符串是不是以数字开头
    public static boolean isStartWithNumber(String str) {
        Pattern pattern = Pattern.compile("[0-9]*");
        Matcher isNum = pattern.matcher(str.charAt(0)+"");
        if (!isNum.matches()) {
            return false;
        }
        return true;
    }