mod_rewrite?

["topinambour ####" <otpinambour@xxxxxxxxx>]

Hi 

I have some problems about
to write rewriterule in .htaccess
I use spip and URL_propre

URL read by google as :
#URL_site/#URL_ARTICLE?page=fr  
i would want to use to remove:?lang=fr and do :
/#URL_SITE/#URL_ARTICLE

Summary, it would be :
http://monsite.org/-Description-?lang=fr 
to redirect to 
http://monsite.org/-Description-

I write :
RewriteRule  ^\?lang=fr$    ^[^\.]$ [L,R=302]    
nothing do

any ideas please