title: Django RegexValidator pattern for ZZ-99-ZZ-9999
body: <p>Trying to make a regex pattern in pattern ZZ-99-ZZ-9999 (2 capital character-2 numbers-2 capital character-4 numbers)</p>
  
  <p>bus_number_regex = RegexValidator(regex=r'^\W{2}-?1?\d{2}-?1?\W{2}-?1?\d{4}$',message="Bus number must be entered in the format: 'ZZ-99-ZZ-9999'"." ZZ must be in Capital.")</p>