以下是用户可能的输入。
<embed src="http://player.youku.com/player.php/sid/XMTQxNzMxMjI0/v.swf" quality="high" width="480" height="400" align="middle" allowScriptAccess="sameDomain" allowFullscreen="true" type="application/x-shockwave-flash"></embed>
http://player.youku.com/player.php/sid/XMTQxNzMxMjI0/v.swf
http://v.youku.com/v_show/id_XMTQxNzMxMjI0.html
我需要一个正则表达式来从提供的输入中提取视频 ID。