code: def compile_masks(masks):
      
  
      if not masks:
          masks = []
      elif not isinstance(masks, (list, tuple)):
          masks = [masks]
  
      return [
          re.compile(mask)
          for mask in masks
      ]
docs: Compiles a list of regular expressions.
  
      :param masks: the regular expressions to compile
      :type masks: list(str) or str
      :returns: list(regular expression object)