code: func isNetworkStatsError(err error) bool {
  	matched, mErr := regexp.MatchString(networkStatsErrorPattern, err.Error())
  	if mErr != nil {
  		seelog.Debugf("Error matching string: %v", mErr)
  		return false
  	}
  
  	return matched
  }
docs: // isNetworkStatsError returns if the error indicates that files in /sys/class/net
  // could not be opened.