title: how can i use preg_match with alphanumeric and unicode acceptance?
body: <p>I am going to build a multilingual website with PHP and need to have a preg_match which passes all Unicode characters and numbers.<br>
  i.e  I need it to pass English letters, Spanish letters,Italian letters and as you may know I don't want to pass other characters like ' " _ -  and ...   </p>
  
  <p>I want some thing like this :</p>
  
  <pre><code>$pattern='/^[unicode chars without \'-_;?]*$/u'; 
  if(!preg_match($pattern, $url))
     echo #error;
  </code></pre>