How to use the parsel.utils.extract_regex function in parsel

def test_extract_regex(regex, text, replace_entities, expected):
    assert extract_regex(regex, text, replace_entities) == expected

def re(self, regex, replace_entities=True):
        """
        Apply the given regex and return a list of unicode strings with the
        matches.

        ``regex`` can be either a compiled regular expression or a string which
        will be compiled to a regular expression using ``re.compile(regex)``.

        By default, character entity references are replaced by their
        corresponding character (except for ``&`` and ``<``).
        Passing ``replace_entities`` as ``False`` switches off these
        replacements.
        """
        return extract_regex(regex, self.get(), replace_entities=replace_entities)