C#正则表达式

//后台.CS文件验证Email格式是否正确：
public bool IsEmail(string str_Email)
{

return System.Text.RegularExpressions.Regex.IsMatch(str_Email, @"^([\w-\.]+)@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([\w-]+\.)+))([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)$");

}


1. 验证 E-mail格式

public bool IsEmail(string str_Email)   
{       
 return System.Text.RegularExpressions.Regex.IsMatch(str_Email,@"^([/w-/.]+)@((/[[0-9]{1,3}/.[0-9]{1,3}/.[0-9]{1,3}/.)|(([/w-]+/.)+))([a-zA-Z]{2,4}|[0-9]{1,3})(/]?)$");  
}  

2. 验证 IP 地址
public bool IPCheck(string IP)      
{          
string num = "(25[0-5]|2[0-4]//d|[0-1]//d{2}|[1-9]?//d)";          return Regex.IsMatch(IP,("^" + num + "//." + num + "//." + num + "//." + num + "$"));       
} 

3. 验证 URL

public bool IsUrl(string str_url)     
{        
return System.Text.RegularExpressions.Regex.IsMatch(str_url, @"http(s)?://([/w-]+/.)+[/w-]+(/[/w- ./?%&=]*)?");     
}  


二.  常用数字验证技巧

1. 验证电话号码

public bool IsTelephone(string str_telephone)    
{        
return System.Text.RegularExpressions.Regex.IsMatch(str_telephone, @"^(/d{3,4}-)?/d{6,8}$");    
} 


2. 输入密码条件(字符与数据同时出现)

public bool IsPassword(string str_password)    
{                   
return System.Text.RegularExpressions.Regex.IsMatch(str_password, @"[A-Za-z]+[0-9]");    
} 


3. 邮政编号

public bool IsPostalcode(string str_postalcode)    
{        
return System.Text.RegularExpressions.Regex.IsMatch(str_postalcode, @"^/d{6}$");    
} 


4. 手机号码

public bool IsHandset(string str_handset)    
{        
return System.Text.RegularExpressions.Regex.IsMatch(str_handset, @"^[1]+[3,5]+/d{9}$");    
} 


5. 身份证号

public bool IsIDcard(string str_idcard)    
{        
return System.Text.RegularExpressions.Regex.IsMatch(str_idcard, @"(^/d{18}$)|(^/d{15}$)");    
} 


6. 两位小数

public bool IsDecimal(string str_decimal)    
{            
return System.Text.RegularExpressions.Regex.IsMatch(str_decimal, @"^[0-9]+(.[0-9]{2})?$");    
} 


7. 一年的12个月

public bool IsMonth(string str_Month)    
{        
return System.Text.RegularExpressions.Regex.IsMatch(str_Month, @"^(0?[[1-9]|1[0-2])$");    
} 


8. 一个月的31天

public bool IsDay(string str_day)    
{        
return System.Text.RegularExpressions.Regex.IsMatch(str_day, @"^((0?[1-9])|((1|2)[0-9])|30|31)$");    
} 


9. 数字输入

public bool IsNumber(string str_number)     
{        
return System.Text.RegularExpressions.Regex.IsMatch(str_number, @"^[0-9]*$");     
} 


10. 密码长度 (6-18位)

public bool IsPasswLength(string str_Length)    
{        
return System.Text.RegularExpressions.Regex.IsMatch(str_Length, @"^/d{6,18}$");    
} 


11. 非零的正整数

public bool IsIntNumber(string str_intNumber)    
{        
return System.Text.RegularExpressions.Regex.IsMatch(str_intNumber, @"^/+?[1-9][0-9]*$");    
} 



三. 常用字符验证技巧

1. 大写字母

public bool IsUpChar(string str_UpChar)    
{        
return System.Text.RegularExpressions.Regex.IsMatch(str_UpChar, @"^[A-Z]+$");    
} 


2. 小写字母

public bool IsLowChar(string str_UpChar)    
{       
 return System.Text.RegularExpressions.Regex.IsMatch(str_UpChar, @"^[a-z]+$");   
} 

3. 检查字符串重复出现的词

private void btnWord_Click(object sender, EventArgs e)     
{            System.Text.RegularExpressions.MatchCollection matches = System.Text.RegularExpressions.Regex.Matches(label1.Text, @"/b(?<word>/w+)/s+(/k<word>)/b",System.Text.RegularExpressions.RegexOptions.Compiled | System.Text.RegularExpressions.RegexOptions.IgnoreCase);            
if (matches.Count != 0)            
{                
  foreach (System.Text.RegularExpressions.Match match in matches)                
  {                    
    string word = match.Groups["word"].Value;                    
    MessageBox.Show(word.ToString(),"英文单词");                
  }            
}            
else { MessageBox.Show("没有重复的单词"); }        }  


4. 替换字符串

private void button1_Click(object sender, EventArgs e)   
{                    
   string strResult = System.Text.RegularExpressions.Regex.Replace(textBox1.Text, @"[A-Za-z]/*?", textBox2.Text);        
   MessageBox.Show("替换前字符:" + "/n" + textBox1.Text + "/n" + "替换的字符:" + "/n" + textBox2.Text + "/n" +  "替换后的字符:" + "/n" + strResult,"替换");    
} 

5. 拆分字符串

private void button1_Click(object sender, EventArgs e)   
{        
   //实例: 甲025-8343243乙0755-2228382丙029-32983298389289328932893289丁        
   foreach (string s in System.Text.RegularExpressions.Regex.Split(textBox1.Text,@"/d{3,4}-/d*"))        
   {            
      textBox2.Text+=s; //依次输出 "甲乙丙丁"        
   }    
}

6. 验证输入字母 

public bool IsLetter(string str_Letter)   
{        
   return System.Text.RegularExpressions.Regex.IsMatch(str_Letter, @"^[A-Za-z]+$");   
} 

7. 验证输入汉字

public bool IsChinese(string str_chinese)   
{        
   return System.Text.RegularExpressions.Regex.IsMatch(str_chinese, @"^[/u4e00-/u9fa5],{0,}$");   
} 

8. 验证输入字符串 (至少8个字符)

public bool IsLength(string str_Length)  
{        
   return System.Text.RegularExpressions.Regex.IsMatch(str_Length, @"^.{8,}$");  
}