title: C# Getting the src from a iframe html tag?
body: <p>Basically I have a string which the user creates and it may or may not have a iframe link for youtube in. Since this is a client application it doesn't use html tags and I have a special form that shows things like youtube videos. However, I need to get the src from the tag and replace all the data around it with nothing. 
  It may also have multiple links so this needs to be something like regex to do it globally..</p>
  
  <p>Example:
  User string: </p>
  
  <pre><code>&lt;iframe width='300px' height='225px' src='http://www.youtube-nocookie.com/embed/4FhG-UYRHJ0' frameborder='0' allowfullscreen&gt;&lt;/iframe&gt;
  </code></pre>
  
  <p>What I want to be outputted:
  I want the users to just see: <code>http://www.youtube-nocookie.com/embed/4FhG-UYRHJ0</code> then I can handle the rest.</p>
  
  <p>Any help is much appreciated as I have no idea how to even start with this. Thankyou all.</p>