content: # String expansion patterns
  NUMERIC_EXPANSION_PATTERN = r'\[((?:\d+[?:,-])+\d+)\]'
  ALPHANUMERIC_EXPANSION_PATTERN = r'\[((?:[a-zA-Z0-9]+[?:,-])+[a-zA-Z0-9]+)\]'
  
  # IP address expansion patterns
  IP4_EXPANSION_PATTERN = r'\[((?:[0-9]{1,3}[?:,-])+[0-9]{1,3})\]'
  IP6_EXPANSION_PATTERN = r'\[((?:[0-9a-f]{1,4}[?:,-])+[0-9a-f]{1,4})\]'
  
  # Boolean widget choices
  BOOLEAN_WITH_BLANK_CHOICES = (
      ('', '---------'),
      ('True', 'Yes'),
      ('False', 'No'),
  )
  