Symfony2 - delete web from URL and auto-redirect to correct URL

Symfony2 - delete web from URL and auto-redirect to correct URL

I'm using Symfony2 FrameWork and I want to redirect
http://myweb.com/web/demo/hello/Something.htmlto
http://myweb.com/demo/hello/Something.htmlI found one good tutorial in
.htaccess change, it works, but if i try use my first URL, it works too
and there is the problem. I want that only the second URL will working (as
if folder /web/ don't exists). I tried some experiments in my .htaccess
but without any success.
Thanks for any help.