fails parsing all videos on pornhub playlists - fix idea included

[sheepdestroyer]

On pornhub, youtubl-dl only finds videos with numerical viewkeys while parsing playlists. But alphanumerical viewkeys also exist (supported in individual videos).

For instance youtube-dl http://www.pornhub.com/playlist/11320721 only returns 12 vids instead of 49 total.

In pornhub.py, the generic url parser is not the same as the playlist's url parser :
generic parser : _VALID_URL = r'https?://(?:[a-z]+\.)?pornhub\.com/(?:view_video\.php\?viewkey=|embed/)(?P<id>[0-9a-z]+)'
playlist parser : for video_url in set(re.findall('href="/?(view_video\.php\?viewkey=\d+[^"]*)"', webpage))

Changing the playlist parser to copy the generic one fixes the issue for me : for video_url in set(re.findall('href="/?(view_video\.php\?viewkey=[0-9a-z]+[^"]*)"', webpage))

I am not a coder, can not write a proper fix where the playlist function would just call the normal parser. Having just one parser would prevent one getting out of sync like it happened here.