public static function is_vendor_string($vendor)
 {
     return isset($vendor[2]) && pts_strings::string_only_contains($vendor, pts_strings::CHAR_LETTER | pts_strings::CHAR_NUMERIC | pts_strings::CHAR_DECIMAL | pts_strings::CHAR_SPACE | pts_strings::CHAR_DASH) && !pts_strings::has_in_istring($vendor, array('manufacturer', 'vendor', 'unknown', 'generic', 'warning')) && (!isset($vendor[7]) || strpos($vendor, ' ') !== false || pts_strings::times_occurred($vendor, pts_strings::CHAR_NUMERIC) == 0) && pts_strings::string_contains($vendor, pts_strings::CHAR_LETTER) && (isset($vendor[4]) || pts_strings::times_occurred($vendor, pts_strings::CHAR_LETTER) > 1) && substr($vendor, -1) != '-';
 }