Ionic 1 directive to disable special characters in an input field

gistfile1.txt

.directive('noSpecialChar', function() {
	return {
	  require: 'ngModel',
	  restrict: 'A',
	  link: function(scope, element, attrs, modelCtrl) {
	    modelCtrl.$parsers.push(function(inputValue) {
	      if (inputValue == null)
	        return ''
	      cleanInputValue = inputValue.replace(/[^\w\s]/gi, '');
	      if (cleanInputValue != inputValue) {
	        modelCtrl.$setViewValue(cleanInputValue);
	        modelCtrl.$render();
	      }
	      return cleanInputValue;
	    });
	  }
	}
});