rewrite thread to another thread via nginx

[ezak]

I want to rewrite this thread
/vb/showthread.php?t=111
to another one
/vb/showthread.php?t=222
with nignx rules

I used this, but not working
rewrite ^\/vb\/showthread\.php\?t\=111 /vb/showthread.php?t=222 permanent;

how to fix this problem