I'm facing issue with select2 tags/options selection. I need to prevent duplicate option selection.

Here is the code I'm using

$email_receiver = $(".email_receiver");
$($email_receiver).select2({
   tags: true
});
$($email_receiver).on('select2:select', function(ev) {
  var emailid = ev.params.data.id;
  if (!check_value_is_email_address(emailid)){
   $(`.email_receiver option[value="${emailid}"]`).detach();
  }
});
function check_value_is_email_address(value){
  var email_regex = /^(([^<>()\[\]\\.,;:\s@"]+(\.[^<>()\[\]\\.,;:\s@"]+)*)|(".+"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/;
  return email_regex.test(value);
}