How to use the doc8.utils.contains_url function in doc8

def _txt_checker(self, parsed_file):
        for i, line in enumerate(parsed_file.lines_iter()):
            if len(line) > self._max_line_length:
                if not utils.contains_url(line):
                    yield (i + 1, "D001", "Line too long")

docutils_nodes.section,
        )
        for i, line in enumerate(lines):
            if len(line) > self._max_line_length:
                in_directive = False
                for (start, end) in directives:
                    if i >= start and i <= end:
                        in_directive = True
                        break
                if in_directive:
                    continue
                stripped = line.lstrip()
                if " " not in stripped:
                    # No room to split even if we could.
                    continue
                if utils.contains_url(stripped):
                    continue
                nodes = find_containing_nodes(i + 1)
                if any_types(nodes, skip_types):
                    continue
                if self._allow_long_titles and any_types(nodes, title_types):
                    continue
                yield (i + 1, "D001", "Line too long")