htaccess question

Strictly speaking this is a question about .htaccess, but I'm using that to solve a problem with Wordpress and it's plugins which are PHP code I've been tinkering with. Hopefully someone has some ideas; I've not had any luck elsewhere.

I'm using an extensively modified version of Bunny's Technorati Tags to tag my posts on a wordpress site. I've been trying to implement David Gagne's Hack (http://www.davidgagne.net/?p=6179) to make the tags link to my own site search rather than to technorati. Which involves using .htaccess to re-write tag urls to the search page.

The difference between my site and Dave's (where it works) is that he is not using url re-writing on his article posts whereas I've used rewriting to have /category/title urls for posts.

I've put the suggested rewrite rule into my .htaccess, but it still 404's and I've not managed to figure out a solution


# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteRule ^tags/([^/]+)$ /index.php?s=$1 [R]
RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>
# END WordPress


Suggestions?