Redirect query string with mod_rewrite (vice versa)

Question

Suppose I have URL's with query string, ie: /DesignPatterns

Using mod_rewrite, how can I redirect them to: /index.php?book=DesignPatterns

is it correct the following?

 RewriteCond %{QUERY_STRING} (\w+) 
 RewriteRule ^index.php?book=%1? [L,R=301]

PS: The original question: How can I match query string variables with mod_rewrite? (Feb 12 '10, Patrick McElhaney, I am asking following his permission)

Answer 1

The complete solution would be

RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.+) index.php?search=$1 [L]