jQuery.validator.addMethod("validateemail", function(value, element) {
  return this.optional(element) || /^([a-zA-Z0-9_\.\-\+\@\_\!\@\#\$\%\^\&\*\(\)\=\\\[\]])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/i.test(value);
}, "Please enter a valid email address."); 

$("#forgetPasswordForm").validate({
    rules: {
        owner_email: {
            required: true,
            validateemail: true
        }
    },
    messages: {
        owner_email: {
            required: "Please enter email is required",
            validateemail: "Please enter a valid email address."
        }
    },
    errorElement: 'span',
    errorPlacement: function(error, element) {
        $('.password').css('display','none');
        error.addClass('invalid-feedback');
        element.closest('.form-group').append(error);
    },
    highlight: function(element, errorClass, validClass) {
        $(element).parent().addClass('is-invalid');
    },
    unhighlight: function(element, errorClass, validClass) {
        $(element).parent().removeClass('is-invalid');
    }
})