title: Regexp in Ruby does not give the expected result
body: <p>I have some strings like <code>2015 - THIS Test</code> and <code>2015 - THAT Test</code>.</p>
  
  <p>I want to have the part <code>THIS Test</code> or <code>THAT Test</code> so I tried this:</p>
  
  <pre><code>"2015 - THIS Test"[/((THIS|THAT)\s\.*)/]
  </code></pre>
  
  <p>But that only gives me <code>THIS</code> or <code>THAT</code>.</p>
  
  <ul>
  <li>Why does it cut the rest?</li>
  <li>How to get the desired substring correctly?</li>
  </ul>
  
  <p>I don't want to rely on just cutting the first 7 characters.</p>