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A complex regex validation on the email address doesn’t introduce an additional solution, it introduces an additional problem.
We can validate email address at client side and server side.
Dim idn = New Idn Mapping 'Pull out and process domain name (throws Argument Exception on invalid) Dim domain Name As String = idn.
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method does not verify that the top-level domain name is a valid domain name listed at the IANA Root Zone Database, which would require a look-up operation. Is Null Or White Space(email) Then Return False ' Use Idn Mapping class to convert Unicode domain names. Value & domain Name End Function 'Normalize the domain email = Regex. If they are used in a regular expression library, you can call them by using code such as the following: class Program // The example displays the following output: // Valid: [email protected]// Valid: [email protected]// Valid: [email protected]// Invalid: [email protected]// Valid: [email protected] // Valid: js#[email protected]// Valid: [email protected][18.104.22.168] // Invalid: [email protected]// Invalid: js*@// Invalid: [email protected]// Valid: [email protected] // Valid: [email protected]// Valid: "j\"s\""@// Valid: [email protected]中国 Public Class Application Public Shared Sub Main() Dim email Addresses() As String = For Each email Address As String In email Addresses If Regex Utilities. This is to verify that I actually own that email address before my account is activated.At this point, why keep parsing email addresses for their format?To validate email address on client side, we can use java script with regular expression.Java script can check the regular expression pattern for valid email address.