RestService::validateActivityCode

static function validateActivityCode($code)
{
	if (empty($code))
	{
		throw new RestException('Empty activity code!', self::ERROR_ACTIVITY_VALIDATION_FAILURE);
	}
	if (!is_string($code) || !preg_match('#^[a-z0-9.-_]+$#i', $code))
	{
		throw new RestException('Wrong activity code!', self::ERROR_ACTIVITY_VALIDATION_FAILURE);
	}
}