Parsing Github Fenced code blocks

gistfile1.php

Route::get('/regtest', function(){

  $test = '

```php
use Namespace1\Namespace2\Namespace3;

class Article extends Model
{
    public function identifiableName()
    {
        return $this->title;
    }
}

```

```javascript
use Namespace1\Namespace2\Namespace3;

class Article extends Model
{
    public function identifiableName()
    {
        return $this->title;
    }
}

```

';
  
  $test = addslashes($test);
  // Added by Starck Lin - parsing Github Fenced code blocks
  $test = preg_replace("/\n```([A-z :]+)([^```]+?)\n```/", '<pre class="lang:$1">$2</pre>', $content );
  $test = preg_replace("/\n```([^```]+?)\n```/", '<pre>$1</pre>;', $content );

  return $test;

});