C# 中的字符串正则验证函数示例

    //判断部分
    public class GF_IsOk
    {
        /// <summary>
        /// 判读是否是IP地址
        /// </summary>
        /// <param name="in_str"></param>
        /// <returns></returns>
        public static bool IsIPStr(string  in_str)
        {
            IPAddress ip;
            return IPAddress.TryParse(in_str, out ip);
        }
 
        /// <summary>
        /// 判断是否是数字
        /// </summary>
        /// <param name="strNumber"></param>
        /// <returns></returns>
        public static bool IsNumber(string strNumber)
        {
 
            Regex objNotNumberPattern = new Regex("[^0-9.-]");
            Regex objTwoDotPattern = new Regex("[0-9]*[.][0-9]*[.][0-9]*");
            Regex objTwoMinusPattern = new Regex("[0-9]*[-][0-9]*[-][0-9]*");
            String strValidRealPattern = "^([-]|[.]|[-.]|[0-9])[0-9]*[.]*[0-9]+$";
            String strValidIntegerPattern = "^([-]|[0-9])[0-9]*$";
            Regex objNumberPattern = new Regex("(" + strValidRealPattern + ")|(" + strValidIntegerPattern + ")");
            return !objNotNumberPattern.IsMatch(strNumber) &&
                   !objTwoDotPattern.IsMatch(strNumber) &&

                   !objTwoMinusPattern.IsMatch(strNumber) &&
                   objNumberPattern.IsMatch(strNumber);
        }
        
        /// <summary>
        ///  判断是否是日期字符串
        /// </summary>
        /// <param name="in_str"></param>
        /// <returns></returns>
        public static bool IsDateStr_yyyymmdd(string in_str)
        {
            if (in_str == "") return true;
            if (in_str.Length != 8) return false;
            return IsDateStr(in_str);
        }
 
        /// <summary>
        /// 判断是否是日期字符串
        /// </summary>
        /// <param name="in_str"></param>
        /// <returns></returns>
        public static bool IsDateStr(string in_str)
        {
            if (in_str == "") return true;
            if (in_str.Length == 8)
                in_str = in_str.Substring(0, 4) + "-" + in_str.Substring(4, 2) + "-" + in_str.Substring(6, 2);
            DateTime dtDate;
            bool bValid = true;
            try
            {