以下哪一项正则能正确的匹配网址: http://www.bilibili.com/video/av2106()

A、/^(https?:\/\/)?([a-zA-Z\d]+).bilibili.com\/?video\/av(\D{1,8})\/?$/
B、/^(http:\/\/)?(\w+)\.bilibili\.com\/?video\/av(\d{1,8})\/?$/
C、/^(https?:\/\/)?(\w+)\.bilibili\.com\/?\w*$/
D、/^(http:\/\/)?([a-zA-Z\d]+).bilibili.com\/?video\/av\w*\/+$/