htaccess rewrite url remove subdirectory

I'm trying to rewrite

http://www.example.com/directory/folder/*

to

http://www.example.com/directory/*

the htaccess file is in directory

this is my .htaccess file :

RewriteEngine on
RewriteBase /directory/
RewriteRule ^(.*)$ folder/$1 [L]

Any help would be much appreciated.