/// <summary>

        /// 判断是否十六进制格式字符串

        /// </summary>

        /// <param name="str"></param>

        /// <returns></returns>

        public bool IsHexadecimal(string str)

        {

            const string PATTERN = @"[A-Fa-f0-9]+$";

            return System.Text.RegularExpressions.Regex.IsMatch(str, PATTERN);

        }

        /// <summary>

        /// 判断是否八进制格式字符串

        /// </summary>

        /// <param name="str"></param>

        /// <returns></returns>

        public bool IsOctal(string str)

        {

            const string PATTERN = @"[0-7]+$";

            return System.Text.RegularExpressions.Regex.IsMatch(str, PATTERN);

        }

        /// <summary>

        /// 判断是否二进制格式字符串

        /// </summary>

        /// <param name="str"></param>

        /// <returns></returns>

        public bool IsBinary(string str)

        {

            const string PATTERN = @"[0-1]+$";

            return System.Text.RegularExpressions.Regex.IsMatch(str, PATTERN);

        }

        /// <summary>

        /// 判断是否十进制格式字符串

        /// </summary>

        /// <param name="str"></param>

        /// <returns></returns>

        public bool IsDecimal(string str)

        {

            const string PATTERN = @"[0-9]+$";

            return System.Text.RegularExpressions.Regex.IsMatch(str, PATTERN);

        }