code: func parseScsiSerial(output string) (string, error) {
  	substrings := scsiRegex.FindStringSubmatch(output)
  	if substrings == nil {
  		return "", fmt.Errorf("scsi_id output cannot be parsed: %q", output)
  	}
  
  	return substrings[1], nil
  }
docs: // Parse the output returned by scsi_id and extract the serial number