常用正则表达式 c#

  /// <summary>
        /// 是否手机号
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>
        public static bool isPhone(string str)
        {
            return System.Text.RegularExpressions.Regex.IsMatch(str, @"^[1]+[3,5,8]+\d{9}");
        }

        /// <summary>
        /// 是否为xxxx-xx-xx的时间格式
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>
        public static bool isDateTime(string str)
        {
            return System.Text.RegularExpressions.Regex.IsMatch(str, @"\d{4}-(1[0-2]|[0]?\d)-(3[01]|[0-2]?\d)");
        }
        /// <summary>
        /// 是否为4个汉字以内（含4个）的名字
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>
        public static bool isName(string str)
        {
            return System.Text.RegularExpressions.Regex.IsMatch(str, @"^[\u4E00-\u9FA5]{0,4}$");
        }

        /// <summary>
        /// 验证身份号证
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>
        public static bool IsIDcard(string str)
        {
            return System.Text.RegularExpressions.Regex.IsMatch(str, @"(^\d{18}$)|(^\d{15}$)");
        }

        /// <summary>
        /// 验证是否为邮政编码
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>

        public static bool IsPostalcode(string str)
        {
            return System.Text.RegularExpressions.Regex.IsMatch(str, @"^\d{6}$");
        }
        /// <summary>
        /// 验证是否为邮箱
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>
        public static bool isEmail(string str)
        {
            return System.Text.RegularExpressions.Regex.IsMatch(str, @"\w+([-+.‘]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*");
        }
        /// <summary>
        /// 验证是否是纯数字和字母组合
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>
        public static bool IsNumAndWord(string str){

            return System.Text.RegularExpressions.Regex.IsMatch(str, @"^(-?\d+)(\.\d+)$");

        }
        /// <summary>
        /// 验证是否是纯字母
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>
        public static bool IsWord(string str)
        {
            return System.Text.RegularExpressions.Regex.IsMatch(str, @"^[a-zA-Z]+$");
        }
       /// <summary>
       /// 验证六位数以上数字，符号，字母任意两种混合的密码验证策略
       /// </summary>
       /// <param name="str"></param>
       /// <returns></returns>
        public static bool ishunhe(string str)
        {
            return System.Text.RegularExpressions.Regex.IsMatch(str, @"^[a ^(?![0-9]+$)(?![a-zA-Z]+$)(?!([^(0-9a-zA-Z)]|[\(\)])+$)([^(0-9a-zA-Z)]|[\(\)]|[a-zA-Z]|[0-9]){6,}$");
        }
        /// <summary>
        /// 判断是否为双精度
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>
        public static bool isDouble(string str)
        {
            return System.Text.RegularExpressions.Regex.IsMatch(str, @"^[-\+]?\d+(\.\d+)$");
        }