title: htaccess and polish phrases - friendly url
body: <p>I have to create a friendly url with polish phrases. 
  Finally, my .htaccess should accept all letters (and polish letters too), numbers, plus(+) and minus(-).
  Can you help me?</p>
  
  <p>Thanks!</p>
  
  <p>My url: </p>
  
  <pre><code>cat-3,woj-4,Kraków 
  </code></pre>
  
  <p>My htaccess: </p>
  
  <pre><code>RewriteRule ^cat-([0-9]+),woj-([0-9]+),(['/^\p{L}+$/ui']+)/?$ show_list_adverts.php?mode=searching&amp;cat_id=$1&amp;search_province=$2&amp;search_city=$3 [L]
  </code></pre>