I have a site that I just redid and I want to 301 redirect all old URL's to the new ones.

The old site was: /keyword_keyword_keyword.html the new site is /keyword-keyword-keyword/

So I'm trying to replace underscores with dashes and then replace the .html with a forward slash.

I have this:

Code:
DirectoryIndex index.php index.html

# BEGIN WordPress

RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
# END WordPress

# BEGIN 301 Redirects

# REPLACE one underscore at a time until there is one or less left
RewriteRule ^([^_]*)_([^_]*_.*) $1-$2 [N]

# REPLACE the last underscrore and do an external redirect
RewriteRule ^([^_]*)_([^_]*)$ /$1-$2 [L,R=301]

# Replace .html with a /
RedirectMatch 301 (.*)\.html$ http://http://www.website.com/$1/

# END 301 Redirects
It does not seem to be working as old URL's redirect to the front page. Any advice is appreciated.