title: configure a regex path in yaml to exclude exceptions
body: <p>In monolog you can exclude path so that when an exception happens it doesn't get logged into prod.log </p>
  
  <p>I wanted to exclude all logs from /items/* so I did the following:</p>
  
  <pre><code>monolog:
      handlers:
          main:
              type: fingers_crossed
              action_level: error
              handler: file
              channels: ["!doctrine", "!event", "!security", "!request"]
              excluded_404s:
                  - ^/items/
  </code></pre>
  
  <p>I wanted to exclude errors from <code>/items/19283712</code> and anything that has <code>/items/WHATEVERCRAPINHERE</code> . The documentation shown <a href="http://symfony.com/doc/current/cookbook/logging/monolog_regex_based_excludes.html" rel="nofollow">here</a> details on how to do it.  I've tried the regex above and it doesn't seem to work. Why is this?</p>