Regex validation for email with specific condition

Question

Currently I am using below code to validate email

public static bool IsValidEmail(string email)
        {
            var r = new Regex(@"^([0-9a-zA-Z]([-\.\'\w]*[0-9a-zA-Z])*@([0-9a-zA-Z][-\w]*[0-9a-zA-Z]\.)+[a-zA-Z]{2,9})$");
            return !string.IsNullOrEmpty(email) && r.IsMatch(email);
        }

Now want to validate this "[email protected]" email as valid email id. what change needs to be done in regex?

Don't use a regex? Even emailregex.com is wrong some of the time. You could use learn.microsoft.com/en-us/dotnet/api/… instead. — Jeremy Lakeman
– Jeremy Lakeman, Commented Sep 30, 2021 at 6:47
@jeremy thanks for the reply, I am looking required change/edit in my Regex to accept "[email protected]" — UVerma
– UVerma, Commented Sep 30, 2021 at 7:36
([0-9a-zA-Z][-\w]*[0-9a-zA-Z]\.)+ That's only matching sub-domains that start and end with an alphanumeric, and therefore must have 2 characters. But I still wouldn't try to "fix" the regex, because a regex is never going to be 100% right. Stop trying to use a hammer for everything, use the right tool. If you want to check if an email is valid, try to send a verification code. — Jeremy Lakeman
– Jeremy Lakeman, Commented Sep 30, 2021 at 7:48

Leonardo de Oliveira · Accepted Answer · 2021-09-30 09:38:40Z

3

Using this Regex is not the best way to validate an Email.

But, correcting your Regex to the pattern you asked, it would be like this:

var r = new Regex(@"^([0-9a-zA-Z]([-\.\'\w]*[0-9a-zA-Z])*@([0-9a-zA-Z][-\w]*[0-9a-zA-Z\.])+[.a-zA-Z]{2,9})$");

Still insisting on the regex, you can find a more complete pattern in: https://www.ex-parrot.com/pdw/Mail-RFC822-Address.html

I encourage you to use Microsoft documentation for email address as suggested by @Jeremy Lakeman -> https://learn.microsoft.com/en-us/dotnet/api/system.net.mail.mailaddress.trycreate?view=net-5.0

edited Sep 30, 2021 at 9:38

answered Sep 30, 2021 at 9:00

Leonardo de Oliveira

714 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

Regex validation for email with specific condition

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related