C# 筛选string 类型里面的汉字，获取首字母字母，正则表达式Regex 常用验证

界面效果

1.提取汉字

 private void buttonX1_Click(object sender, EventArgs e)
        {
            if (TxtYuan.Text.Trim() != "")
            {
                string Text = TxtYuan.Text.Trim();
                string TTT = "";
                Regex reg = new Regex("[\u4e00-\u9fa5]+");//正则表达式
                foreach (Match v in reg.Matches(Text))
                {
                    TTT += v.ToString();
                }
                TxtPinYin.Text = TTT;

            }

        }

2.转换拼音首字母

  private void buttonX2_Click(object sender, EventArgs e)
        {
            if (TxtPinYin.Text.Trim() != "")
            {
                TxtShouZiMu.Text = GetFirstPinyin(TxtPinYin.Text.Trim());
            }
        }
        public static string GetFirstPinyin(string str)
        {
            string r = string.Empty;
            foreach (char obj in str)
            {
                try
                {
                    ChineseChar chineseChar = new ChineseChar(obj);
                    string t = chineseChar.Pinyins[0].ToString();
                    r += t.Substring(0, 1);
                }
                catch
                {
                    r += obj.ToString();
                }
            }
            return r;
        }

　　正则表达式

    // 验证文本框输入为数字
        public static bool GetNum(string str)
        {
            return Regex.IsMatch(str, @"^[-]?\d+[.]?\d*$");
        }
        //验证文本框输入为整数
        public static bool validateNum(string strNum)
        {
            return Regex.IsMatch(strNum, "^[0-9]*$");
        }
        //  验证文本框输入为日期
        public static bool IsValidDate(string Date)
        {
          bool bValid = Regex.IsMatch(Date, @"^((((1[6-9]|[2-9]\d)\d{2})-(0?[13578]|1[02])-(0?[1-9]|[12]\d|3[01]))|(((1[6-9]|[2-9]\d)\d{2})-(0?[13456789]|1[012])-(0?[1-9]|[12]\d|30))|(((1[6-9]|[2-9]\d)\d{2})-0?2-(0?[1-9]|1\d|2[0-8]))|(((1[6-9]|[2-9]\d)(0[48]|[2468][048]|[13579][26])|((16|[2468][048]|[3579][26])00))-0?2-29-))$");
           return (bValid && Date.CompareTo("1753-01-01") >= 0);
        }
        //验证文本框输入为电子邮件

        public static bool IsValidEmail(string strIn)
        {
            return Regex.IsMatch(strIn, @"^([\w-\.]+)@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([\w-]+\.)+))([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)$");
        }
        // 验证文本框输入为电话号码
        public static bool validatePhone(string strPhone)
        {
            return Regex.IsMatch(strPhone, @"\d{3,4}-\d{7,8}");
        }
          //验证文本框输入为传真号码
         public static bool validateFax(string strFax)
         {
             return Regex.IsMatch(strFax, @"86-\d{2,3}-\d{7,8}");
         }
         //获取IP的字符串 HttpContext.Current.Request.UserHostAddress
         public static bool IsIP(string ip)
         {
             return Regex.IsMatch(HttpContext.Current.Request.UserHostAddress, @"^（（2[0-4]\d|25[0-5]|[01]?\d\d?）\.）{3}（2[0-4]\d|25[0-5]|[01]?\d\d?）$");
         }
         public static bool IsIPSect(string ip)
         {
             return Regex.IsMatch(HttpContext.Current.Request.UserHostAddress, @"^（（2[0-4]\d|25[0-5]|[01]?\d\d?）\.）{2}（（2[0-4]\d|25[0-5]|[01]?\d\d?|\*）\.）（2[0-4]\d|25[0-5]|[01]?\d\d?|\*）$");

         }
         //验证字符串是否是yy-mm-dd字符串
         public static bool IsDateString(string str)
        {
             return Regex.IsMatch(str, @"（\d{4}）-（\d{1,2}）-（\d{1,2}）");
        }