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I'm currently working on a project that requires login, register, forget password functionality in SwiftUI.  As I'm developing the code, I came across a great resource for validating an email address with Regex:

http://emailregex.com/

In the end, I leveraged the worked produced on https://stackoverflow.com/questions/25471114/how-to-validate-an-e-mail-address-in-swift

The code used:

extension String {

  var isValidEmail: Bool {
    let name = "[A-Z0-9a-z]([A-Z0-9a-z._%+-]{0,30}[A-Z0-9a-z])?"
    let domain = "([A-Z0-9a-z]([A-Z0-9a-z-]{0,30}[A-Z0-9a-z])?\\.){1,5}"
    let emailRegEx = name + "@" + domain + "[A-Za-z]{2,8}"
    let emailPredicate = NSPredicate(format: "SELF MATCHES %@", emailRegEx)
    return emailPredicate.evaluate(with: self)
  }

}