title: preg_replace delete special chars
body: <p>wondering how I can replace all special chars on my string like: <code>hello this is a test!</code></p>
  
  <p>I've wrote this code:</p>
  
  <pre><code>$text = preg_replace("/[^A-Za-z0-9]/", ' ', $text);
  </code></pre>
  
  <p>This works need more flexibility to allow special chars like <code>áéíóú...</code> and remove only certain chars like: <code>:!"#$%&amp;/()=?¿¡</code>...</p>
  
  <p>Any ideas?</p>