code: func ValidatePasswordFormat(password string) error {
  	if len(password) < 10 {
  		return errors.New("password too short (<10 characters)")
  	}
  	if !printable7BitAscii.MatchString(password) {
  		return errors.New("password contains invalid characters - only 7bit printable ascii allowed")
  	}
  	return nil
  }
docs: // ValidatePasswordFormat returns an error if the password is too short, or consists of characters
  // outside the range of the printable 7bit ascii set