Url rewriting faliure in case of UTF8 urls

[omidr]

I want to rewrite some old urls on my site to new ones inorder to prevent
404 errors. For English urls everything is OK and adding a rewrite rule like
the following to the server block works fine.

rewrite ^/omid/$ /omidreza;

But when it comes to urls containing non-English characters the rule doesn`t
work. Has anyone experienced the same issue?

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,245202,245202#msg-245202