[Flow] Add Rewrite Rule to .htaccess

[Patric Eckhart]

Hey guys,

I would rewrite URLS like via .htaccess.

My URL like this: things?u=username&profileview=view&category=cat
and I would rewirte to

things/username/view1/cat1

I have tried this with:
RewriteRule    ^things/username/view1/cat1/?$    things?u=username&profileview=view&category=cat    [NC,L]

.. but it does not work :-(

username, view and cat are dynamic variables.

Can you help me?