<?php
class Validation_AlphaNumeric extends Validation_RegExp {
	protected $message = "Error: %element% must be alphanumeric (contain only numbers, letters, underscores, and/or hyphens).";

	public function __construct($message = "") {
		parent::__construct('/^[a-zA-Z0-9_\-\s\:\,\&]+$/', $message);
	}
}
