C#常用的正则表达式

//验证用户输入的字符串中时候只含有数字或字母,汉字
bool IsValidString(string strIn)
{
return Regex.IsMatch(strIn,@"^[A-Za-z0-9\u4e00-\u9fa5]+$");
}
//验证电子邮件
bool IsValidEmail(string strIn)
{
return

Regex.IsMatch(strIn,@"^([\w-\.]+)@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([\w-]+\.)+))([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)$");
}
//验证用户输入的字符串中时候只含有数字或字母
bool IsValidString(string strIn)
{
return Regex.IsMatch(strIn,@"^[A-Za-z0-9]+$");
}
/// <summary>
/// 判断密码
/// </summary>
/// <param name="PassWord"></param>
/// <returns></returns>
public static bool IsValidPassWord(string PassWord)
{
return Regex.IsMatch(PassWord, @"^(\w){6,20}$");
}

/// <summary>
/// 判断电话/传真
/// </summary>
/// <param name="Tel"></param>
/// <returns></returns>
public static bool IsValidTel(string Tel)
{
return Regex.IsMatch(Tel, @"^[+]{0,1}(\d){1,3}[ ]?([-]?((\d)|[ ]){1,12})+$");
}

/// <summary>
/// 判断手机
/// </summary>
/// <param name="Mobil"></param>
/// <returns></returns>
public static bool IsValidMobil(string Mobil)
{
return Regex.IsMatch(Mobil, @"^(\d)+[-]?(\d){6,12}$");
}

/// <summary>
/// 邮政编码
/// </summary>
/// <param name="Zip"></param>
/// <returns></returns>
public static bool IsValidZip(string Zip)
{
return Regex.IsMatch(Zip, @"^[a-z0-9 ]{3,12}$");
}

/// <summary>
/// 判断日期
/// </summary>
/// <param name="Date"></param>
/// <returns></returns>
public static bool IsValidDate(string Date)
{
bool bValid=Regex.IsMatch(Date, @"^[12]{1}(\d){3}[-][01]?(\d){1}[-][0123]?(\d){1}$");
return (bValid && Date.CompareTo("1753-01-01")>=0);

}

//判断整型
/*public static bool IsValidInt(string Int)
{
return Regex.IsMatch(Int, @"^[1-9]{1}[0-9]{0,6}$");
}*/

/// <summary>
/// 判断只能输字母
/// </summary>
/// <param name="EnName"></param>
/// <returns></returns>
public static bool IsValidEnName(string EnName)
{
return Regex.IsMatch(EnName, @"[a-zA-Z]");
}
C#判断字符串中是否有汉字
using System.Text.RegularExpressions;//先导入这个使用正则表达式

private void isHanzi(string str)
{
Regex reg = new Regex(@"[u4e00-u9fa5]");//正则表达式
if (reg.IsMatch(str))
{
MessageBox.Show("有汉字");
}
else
{
MessageBox.Show("没有汉字");
}
}
C#验证是否是合法邮箱
先 using System.Text.RegularExpressions;
然后按钮中加入
private void button1_Click(object sender, EventArgs e)
{
string reg = @"\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*";
Regex r = new Regex(reg);
if (r.IsMatch(textBox1.Text))
{
MessageBox.Show("格式正确");
}
else
{
MessageBox.Show("不是有效的email地址");
}
}