title: How can I check whether the route "URL" exists?
body: <p>In <em>Laravel 5.2</em>, is there a particular way (handler) to check whether a route is existing or not? Let's say, for a basic URL like:</p>
  
  <pre><code>http://www.example.com/laravel
  </code></pre>
  
  <p>I then want to handle the non-existing URLs (like: <code>/laravel</code>) from my Main Page Router, which is:</p>
  
  <pre><code>Route::get('/{page}', funtion(){
      //check if $page is a valid route URL? Or 404?
  });
  </code></pre>
  
  <p>How do I purposely check whether this route is a valid one or not?</p>