title: How to isolate the largest fragment of string without special characters?
body: <p>What would be the best approach to isolate the largest fragment of a string without special characters?</p>
  <p>For example:</p>
  <pre><code>$string = '!1@22#33333$444';
  </code></pre>
  <p>The output I would be looking for is &quot;33333&quot;.</p>