Using Wildcard Masks to filter black or white email addresses

By using Wildcard mask you can quickly and easily verify bad emails and good emails according to you defined BlackList and WhiteList. To do that, you need to specify the lowest ValidationLevel.

The example below shows how to verify bad and good emails using ComponentSoft email validator library.

C#

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static void Main() { string email = “test@adomain.com“; string emails = “vietnt@hanoictt.com;jimmy@adomain.com“; EmailValidator em = new EmailValidator(); em.ValidationLevel = ValidationLevel.Lists; em.EmailValidated += em_EmailValidated; // You can use wilcards to validate email addresses em.BlackList.Add(“te??@*.com”); em.BlackList.Add(“*@adomain.com”); em.WhiteList.Add(“*@hanoictt.com”); // Validate an email em.Validate(email); // Validate a list of emails em.ValidateEmails(emails); } static void em_EmailValidated(object sender, EmailValidatedEventArgs e) { Console.WriteLine(e.ValidatedLevel == ValidationLevel.Success ? (e.EmailAddress + ” is a valid email”) : (e.EmailAddress + ” is an invalid email”)); }

VB.NET

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Sub Main() Dim email As String = “test@adomain.com“ Dim emails As String = “vietnt@hanoictt.com;jimmy@adomain.com“ Dim em As New EmailValidator() em.ValidationLevel = ValidationLevel.Lists AddHandler em.EmailValidated, AddressOf em_EmailValidated ‘ You can use wilcards to validate email addresses em.BlackList.Add(“te??@*.com”) em.BlackList.Add(“*@adomain.com”) em.WhiteList.Add(“*@hanoictt.com”) ‘ Validate an email em.Validate(email) ‘ Validate a list of emails em.ValidateEmails(emails) End Sub Private Sub em_EmailValidated(ByVal sender As Object, ByVal e As EmailValidatedEventArgs) If e.ValidatedLevel = ValidationLevel.Success Then Console.WriteLine(e.EmailAddress & ” is a valid email”) Else Console.WriteLine(e.EmailAddress & ” is an invalid email”) End If End Sub