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

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; } }

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;
}

// 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}）");
}