title: Google Form Validate a specific URL Regex
body: <p>I am creating a google form and trying to create a regex on of the fields because I need them to enter a profile link from a specific website.  I'm a beginner with regex and this is what I have come up with:</p>
  
  <pre><code>/^(http:\/\/)?(steamcommunity\.com\/id\/)*\/?$/
  </code></pre>
  
  <p>But when I go to enter a test link such as: <a href="http://steamcommunity.com/id/bagzli" rel="nofollow">http://steamcommunity.com/id/bagzli</a> it fails it.  I don't understand what is wrong about it.</p>