title: Get youtube download link url_encoded_fmt_stream_map
body: <p>I am using preg_match_all to get the Youtube video links from a Youtube video page, and put them in Array, but I don't get any result.</p>
  
  <pre><code>preg_match_all('/url_encoded_fmt_stream_map\=(.*)/', $html, $matches);
  </code></pre>
  
  <p>is there a problem in the syntax of first parameter?</p>
  
  <p>Thanks</p>