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var $result = fd.field("FieldName").control()._el().find("br");

function validateEmail(email) {
  var re = /^(([^<>()[\]\\.,;:\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 re.test(email);
}

function validate() {
  fd.field("FieldName").control()._el().find(".ms-formvalidation").remove();
  var email = fd.field("FieldName").value();
  if (validateEmail(email)) {
	return true;
  }
  $result.after('<span class="ms-formvalidation"> Enter a valid Email address.</span>');
  return false;
}

fd.onsubmit(function(){
  return validate();
});