Parsing all possible YouTube urls
<p>I am looking for all the features that a YouTube url can have? </p>

<pre><code>http://www.youtube.com/watch?v=6FWUjJF1ai0&amp;feature=related
</code></pre>

<p>So far I have seen feature=relmfu, related, fvst, fvwrel. Is there a list for this somewhere. Also, my ultimate aim is to extract the video id (6FWUjJF1ai) from all possible youtube urls. How can I do that? It seems to be difficult. Is there anyone who has already done that?</p>
