char only domain name expression for email

Hi M.r Joginder Banger,


can u plz some more expressions provide me,I tried from searching on google.
1)Phone

like 
(country code)(10 dgits) eg:+919000000000
if miss country code then error message display 'plz provide country code' and othervise display 'invalid no'
2)Marks
like
0-100 digits can only enter..not above 100 like 101...200....
3)AcademicYear 
like
yyyy-yyyy
4)Tax
5)Shift 
6)fax

like
+(country code)-(area code)-(fax number)
for example: +1-212-9876543 and with error message,if miss '-' then show 'missing '-'', if missing '+' then show 'missing '+''.

at least cant find country code and area code?

if miss country code then display 'plz provide country code'

if miss area code then display 'plz provide area code'?

Thanks Dawood Abbas.....

oh sorry I mean can allow digits after name but not start with digits
[email protected]

oh sorry change some in expression

"^[a-zA-Z-]+@[a-zA-Z]+\.[a-zA-Z]{2,4}"

i enter only capital condition but you are enter the small letter also.

working there but not working in 'RegularExpressionValidator' in aspx page 
below i attached that page.

check this link ...it's working

https://dotnetfiddle.net/4wgpJQ

have a look this code may be your problem solve.

 public class program
    {
        public bool emailcheck(string emailid)
        {
            bool temp = false;
            Regex reg = new Regex(@"^[A-Z-]+@[A-Z]+\.[A-Z]{2,4}$", RegexOptions.IgnoreCase);
            if (reg.IsMatch(emailid))
                temp = true;          
            return temp;
        }
     // empcode,empname,dob,dept,bloodgroup
      public  static void Main(string[] args)
        {
            program obj = new program();
         Console.WriteLine(   obj.emailcheck("[email protected]")); //true
         Console.WriteLine(obj.emailcheck("[email protected]")); //false
         Console.WriteLine(obj.emailcheck("[email protected]")); //false
         Console.WriteLine(obj.emailcheck("jogi@g%mail.com")); false
            Console.WriteLine(obj.emailcheck("[email protected]")); false
      
        }
 
    }

check online

https://dotnetfiddle.net/4wgpJQ