code: def find_window(self, highlight_locations):
          
  
          if len(self.text_block) <= self.max_length:
              return (0, self.max_length)
  
          num_chars_before = getattr(
              settings,
              'HIGHLIGHT_NUM_CHARS_BEFORE_MATCH',
              0
          )
  
          best_start, best_end = super(ColabHighlighter, self).find_window(
              highlight_locations
          )
          if best_start <= num_chars_before:
              best_end -= best_start
              best_start = 0
          else:
              best_start -= num_chars_before
              best_end -= num_chars_before
  
          return (best_start, best_end)
docs: Getting the HIGHLIGHT_NUM_CHARS_BEFORE_MATCH setting
          to find how many characters before the first word found should
          be removed from the window