// Remove all non-whitelist chars.
		if ($allow_accented_chars)
			$str = preg_replace('/[^a-zA-Z0-9\s\'\:\/\[\]-\pL]/u', '', $str);
		else
			$str = preg_replace('/[^a-zA-Z0-9\s\'\:\/\[\]-]/','', $str);

		$str = preg_replace('/[\s\'\:\/\[\]\-]+/', ' ', $str);
		$str = str_replace(array(' ', '/'), '-', $str);

		// Remove all non-whitelist chars.
		if ($allow_accented_chars)
			$str = preg_replace('/[^a-zA-Z0-9\.\s\'\:\/\[\]-\pL]/u', '', $str);
		else
			$str = preg_replace('/[^a-zA-Z0-9\.\s\'\:\/\[\]-]/','', $str);

		$str = preg_replace('/[\s\'\:\/\[\]\-]+/', ' ', $str);
		$str = str_replace(array(' ', '/', '.'), '-', $str);