code: def find(self, *strings, **kwargs):
          
          start = kwargs.pop("start", 0)
          stop = kwargs.pop("stop", None)
          keys_only = kwargs.pop("keys_only", False)
          results = {string: [] for string in strings}
          stop = len(self) if stop is None else stop
          for i, line in enumerate(self[start:stop]):
              for string in strings:
                  if string in line:
                      if keys_only:
                          results[string].append(i)
                      else:
                          results[string].append((i, line))
          if len(strings) == 1:
              return results[strings[0]]
          return results
docs: Search the entire editor for lines that match the string.
  
          .. code-block:: Python
  
              string = '''word one
              word two
              three'''
              ed = Editor(string)
              ed.find('word')          # [(0, "word one"), (1, "word two")]
              ed.find('word', 'three') # {'word': [...], 'three': [(2, "three")]}
  
          Args:
              strings (str): Any number of strings to search for
              keys_only (bool): Only return keys
              start (int): Optional line to start searching on
              stop (int): Optional line to stop searching on
  
          Returns:
              results: If multiple strings searched a dictionary of string key, (line number, line) values (else just values)