ApexでIPv4アドレスを整形

  // IPv4アドレスを整形 (111.11.01.001 → 111.11.1.1)
  public static String formatIPv4Address(String ipAddress) {
    String[] octets = ipAddress.split('\\.');
    if (octets.size() != 4) {
      return null;
    }
    String formattedIpAddress = '';
    for (Integer i = 0; i < 4; i++) {
      if (i != 0) {
        formattedIpAddress += '.';
      }
      formattedIpAddress += Integer.valueOf(octets[i]).toString();
    }
    return formattedIpAddress;
  }