ASP NET email validator regex

Question

Does anyone know what the regex used by the email validator in ASP NET is

User · Answer

We can use RegularExpressionValidator to validate email address format. You need to specify the regular expression in ValidationExpression property of RegularExpressionValidator. So it will look like

 <asp:RegularExpressionValidator ID="validateEmail"    
  runat="server" ErrorMessage="Invalid email."
  ControlToValidate="txtEmail" 
  ValidationExpression="^([\w\.\-]+)@([\w\-]+)((\.(\w){2,3})+)$" />

Also in event handler of button or link you need to check !Page.IsValid. Check sample code here : sample code

Also if you don't want to use RegularExpressionValidator you can write simple validate method and in that method usinf RegEx class of System.Text.RegularExpressions namespace.

Check example:

example

User · Answer

Here is the regex for the Internet Email Address using the RegularExpressionValidator in  NET   w   -     w     w   -   w      w   -   w      By the way if you put a RegularExpressionValidator on the page and go to the design view there is a ValidationExpression field that you can use to choose from a list of expressions provided by  NET  Once you choose the expression you want there is a Validation expression  textbox that holds the regex used for the validator

User · Answer

I don t validate email address format anymore  Ok I check to make sure there is an at sign and a period after that   The reason for this is what says the correctly formatted address is even their email  You should be sending them an email and asking them to click a link or verify a code  This is the only real way to validate an email address is valid and that a person is actually able to recieve email

User · Answer

E-mail addresses are very difficult to verify correctly with a mere regex  Here is a pretty scary regex that supposedly implements RFC822  chapter 6  the specification of valid e-mail addresses   Not really an answer  but maybe related to what you re trying to accomplish

User · Answer

For regex  I first look at this web site  RegExLib com

User · Answer

Apart from the client side validation with a Validator  I also recommend doing server side validation as well   bool isValidEmail string input        try               var email   new System Net Mail MailAddress input           return true            catch               return false

[asp.net] ASP.NET email validator regex

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