http://gitunderground.i2p/archive/youtube-dl/src/commit/dcdb292fddc82ae11f4c0b647815a45c88a6b6d5/youtube_dl/extractor/porn91.py
_search_regex ( r '时长:\s*</span>\s*(\d+:\d+)' , webpage , 'duration' , fatal = False )) comment_count = int_or_none ( self . _search_regex ( r '留言:\s*</span>\s*(\d+)' , webpage , 'comment count' , fatal = False )) return { 'id' : video_id , 'title' : title , 'url' : video_url , 'duration' : duration , 'comment_count' : comment_count , 'age_limit' : self .