title: Scala regex ignorecase
body: <p>I am trying to match the Roman number from the <code>I</code> to <code>IX</code> with a regex. </p>
  
  <pre><code>val pattern = "(\\sI\\s|\\sII\\s|\\sIII\\s|\\sIV\\s|\\sV\\s|\\sVI\\s|\\sVII\\s|\\sVIII\\s|\\sIX\\s)".r
  </code></pre>
  
  <p>This can only matches the upper case. I want to ignore the case. </p>
  
  <p>My test string is <code>"Mark iii "</code>.</p>