Regular Expression for email for a specific domain name

Question

This is my code:

<asp:RegularExpressionValidator ID="regexEmail" 
     runat="server" ValidationExpression="(\w+@[test]+?\.[com]{3})" 
     ErrorMessage="Please Enter Valid Email Id" 
     ControlToValidate="txtEmailAddress" />

which is not working. But my problem does not end there. I would also like to know how to validate only characters in the username, and not numbers and special characters.

Please if anybody could help with this code. Thanks in Advance.

Answer 1

^[a-zA-Z]+@yourdomain\.com$

should do the trick

Answer 2

At first I think there is a miss understanding of the square brackets. With [com]{3} you are createing a character class and match 3 characters out of this class, that means this will match com (I think as you wanted), but also ccc, cmc and so on.

Similar for [test]+?, this matches at least 1 character from t, e and s

When you say:

validate only characters in the username, and not numbers and special characters

I think you mean only letters? Or only ASCII letters?

What you meant is probably

(\w+@test\.com)

\w is a character class that contains A-Za-z0-9 and _ (and maybe anything thats a letter in unicode, I am not sure). If you want only ASCII characters then create your own character class with [A-Za-z], if you want to allow any letter use the Unicode property \p{L}

Something like this

@"^(\p{L}+@test\.com)$"