.net 更改时间格式

/// <summary>
        /// 更改时间格式[HH:mm:ss]到[HHmmss]
        /// </summary>
        /// <param name="input"></param>
        /// <returns></returns>
        public static string TimeToJsonTime(string input)
        {
            string result = null;
            try
            {
                string searchExpress = "\\W(?<hour>\\d{1,2}):(?<minutes>\\d{1,2}):(?<seconds>\\d{1,2})\\W";

                
                string replaceExpress = "\"${hour}${minutes}${seconds}\"";
                result = Regex.Replace(input,
                    searchExpress,
                    replaceExpress);
            }
            catch (Exception)
            {
                
                throw;
            }
            return result;
        }