code: def find(self, sub, in_current_line=False, include_current_position=False,
               ignore_case=False, count=1):
          
          assert isinstance(ignore_case, bool)
  
          if in_current_line:
              text = self.current_line_after_cursor
          else:
              text = self.text_after_cursor
  
          if not include_current_position:
              if len(text) == 0:
                  return  # (Otherwise, we always get a match for the empty string.)
              else:
                  text = text[1:]
  
          flags = re.IGNORECASE if ignore_case else 0
          iterator = re.finditer(re.escape(sub), text, flags)
  
          try:
              for i, match in enumerate(iterator):
                  if i + 1 == count:
                      if include_current_position:
                          return match.start(0)
                      else:
                          return match.start(0) + 1
          except StopIteration:
              pass
docs: Find `text` after the cursor, return position relative to the cursor
          position. Return `None` if nothing was found.
  
          :param count: Find the n-th occurance.