Extracting multiple items from _VALID_URL

[TRox1972]

Normally extractors get the video_id of a url using

video_id = self._match_id(url)

where _VALID_URL = r'https?://(?:www\.)example\.com/v/(?P<id>\d.+)'.

But have would one go about extracting multiple items from the url, e.g. if

But if one have multiple groups inside the _VALID_URL, e.g.

_VALID_URL = r'https?://(?:www\.)example\.com/v/(?P<id>\d.+)/(?P<second_id>[^/?]+)'

how would it be possible to get the second_id from _VALID_URL inside e.g. _real_extract? As far as I can see, there isn't any functions to match regex on _VALID_URL except _match_id.