ASP NET email validator regex

Question

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

User · Accepted 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

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

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

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

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     lt asp RegularExpressionValidator ID  validateEmail        runat  server  ErrorMessage  Invalid email     ControlToValidate  txtEmail     ValidationExpression      w   -       w -         w  2 3         gt    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

For regex  I first look at this web site  RegExLib com

[asp.net] ASP.NET email validator regex

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