title: Yii2 Url Manager allow plus (+) in url
body: <p>I'm trying to allow plus signs in the url, but I keep ending up at the 404 page. I'm trying to match urls like this: page/page+with+spaces</p>
  
  <p>With "page+with+spaces" being the slug.</p>
  
  <p>This is what I have in the config:</p>
  
  <pre><code>    'urlManager'   =&gt; [
          'class'           =&gt; 'yii\web\UrlManager',
          'enablePrettyUrl' =&gt; true,
          'showScriptName'  =&gt; false,
          'rules'           =&gt; [
              'page/&lt;slug:[a-zA-Z\+\-]+&gt;' =&gt; 'page/view',
          ],
      ],
  </code></pre>