title: Warning: preg_match() [function.preg-match]: No ending delimiter '^' found
body: <p>I am trying to resolve an issue I have been having with one of my wordpress plugins. </p>
  
  <p>This is line 666</p>
  
  <pre><code>function isUrl($url)
  {
      return preg_match("^http:\/\/[-0-9a-z\._]+.*$/i", trim( $url ));
  }
  </code></pre>
  
  <p>What are your inputs on how I can resolve this warning? It's quite irritating. I can't figure it out and I've tried, researched everything!</p>