Why doesn't CNC regex work in .htaccess?

Question

htaccess

Good evening!
There are links like:
site.ru//news.php?city=1&park=2&page=1
I want to get from this:
site.ru/1/2/news/page/1
Here is what I write in .htacces:
RewriteCond %{REQUEST_URI} ^\/([az]+)\/([az]+)\/news\/([az\-]+)[\/]*$
RewriteRule ^(.*)$ news\.php\?city =%1&park=%2&page=%3 [L]
But it doesn't work.. What's wrong?
Thanks in advance!