form.js

app.validateForm = function(form) {
	var $form = form,
	$requiredFields = $form.find('[data-required="true"]'),
	mailRegex = new RegExp("[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*@(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?");
	$requiredFields.each(function () {
		var $this = $(this),
		$element = $this.is('input') ? $this.parent() : $this;
		if (!$this.val()) {
			$element.addClass('error-field');
		} else {
			if ($this.is('[data-regex="email"]')) {
				if (mailRegex.test($this.val())) {
					$element.removeClass('error-field');
				} else {
					$element.addClass('error-field');
				}
			} else if ($this.is('[data-confirm]')) {
				var toCheck = $this.data('confirm');
				var $input = $form.find('[name="' + toCheck + '"]');
				if (!($input.parent().hasClass('error-field')) && $this.val() === $input.val()) {
					$element.removeClass('error-field');
				} else {
					$element.addClass('error-field');
				}
			} else {
				$element.removeClass('error-field');
			}
		}
	});
}