title: Regex to match greek characters?
body: <p>I constructed the following regex</p>
  
  <pre><code>preg_match_all('#(autom(.*?)tic|(.*?)anual)#', $str2b, $gears);
  </code></pre>
  
  <p>but I want to change it to match greek characters. I would like to match the words <code>βενζίνη</code> and  <code>πετρέλαιο</code> but I don't get it to work.</p>
  
  <pre><code>preg_match_all('#(βενζί(.*?)η|πετρέλ(.*?)ιο)#', $str2b, $gears);
  </code></pre>
  
  <p>How can I do this?</p>