code: func (m *Measurement) Clone() *Measurement {
  	var regexp *RegexLiteral
  	if m.Regex != nil && m.Regex.Val != nil {
  		regexp = &RegexLiteral{Val: m.Regex.Val.Copy()}
  	}
  	return &Measurement{
  		Database:        m.Database,
  		RetentionPolicy: m.RetentionPolicy,
  		Name:            m.Name,
  		Regex:           regexp,
  		IsTarget:        m.IsTarget,
  		SystemIterator:  m.SystemIterator,
  	}
  }
docs: // Clone returns a deep clone of the Measurement.