title: How to strip a sentence just keep letters, numbers, spaces
body: <p>I have a lot of sentences that need to be cleaned up from all the special characters and punctuations (I want to keep just the letters and numbers and spaces), for example:</p>
  
  <pre><code>$string = "TB Avrupa ve Türkiye'nin en iyi oranlari ile Lider Bahis Sitesi!!";
  $final_title = preg_replace('/[^a-z]+/i', '', $string); 
  </code></pre>
  
  <p>This remove everything (with spaces)
  I need to keep spaces can i add anything to the previous line to achieve this ??</p>
  
  <p>Expected output :</p>
  
  <pre><code>TB Avrupa ve Türkiyenin en iyi oranlari ile Lider Bahis Sitesi
  </code></pre>