class SlideshareIE(InfoExtractor):
- _VALID_URL = r'https?://www\.slideshare\.net/[^/]+?/(?P<title>.+?)($|\?)'
+ _VALID_URL = r'https?://(?:www\.)?slideshare\.net/[^/]+?/(?P<title>.+?)($|\?)'
_TEST = {
'url': 'http://www.slideshare.net/Dataversity/keynote-presentation-managing-scale-and-complexity',