Answer by Suhaib Janjua for How can I validate an email address using a regular expression?

I always use the below regular expression to validate the email address. This is the best regex I have ever seen to validate email address.

"\A(?:[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*@(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?)\Z";

This regular expression I always uses in my Asp.NET Code and I'm pretty satisfied with it.

use this assembly reference

using System.Text.RegularExpressions;

and try the following code, as it is simple and do the work for you.

private bool IsValidEmail(string email) {    bool isValid = false;    const string pattern = @"\A(?:[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*@(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?)\Z";    isValid = email != ""&& Regex.IsMatch(email, pattern);    // an alternative of the above line is also given and commented    //    //if (email == "") {    //    isValid = false;    //} else {    //    // address provided so use the IsMatch Method    //    // of the Regular Expression object    //    isValid = Regex.IsMatch(email, pattern);    //}    return isValid;}

this function validates the email string. If the email string is null, it returns false, if the email string is not in a correct format it returns false. It only returns true if the format of the email is valid.