Rewrite URL requests for an .html extension to lowercase, remove extension and then add trailing slash

I'm working on a WordPress website that has some '.html' in the root folder (previous developer) and I need to convert all requests made for a .html only .

For a successful script it needs to:

  1. remove .html extension
  2. convert all chars to lowercase
  3. add a trailing slash
  4. (obviously) still be able to grab the requested file

This is my solution so far and it does everything except convert the URL to lowercase and also causes no conflicts to the WordPress URL structures: 

RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_URI} !(\.[a-zA-Z0-9]{1,5}|/)$
RewriteRule (.*)$ /$1/ [R=301,L]

RewriteCond %{REQUEST_FILENAME}.html -f
RewriteRule ^([^/]+)/?$ $1.html

RewriteCond %{REQUEST_FILENAME}.html -f
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^([^/]+)/([^/]+)/?$ $1_$2.html [L]

EDIT:

I take it back. The above script didn't do what I needed it to do so I am open to all suggestions for this that use the .htaccess file in the root directory

Solutions

Adjust your Apache configuration to use mod_rewrites RewriteMap directives: 

RewriteMap lc int:tolower
RewriteRule (.*?[A-Z]+.*) ${lc:$1} [R]

See the Apache manual here: Redirect a URI to an all-lowercase.

Important note from the documentation:

Per-directory and .htaccess context

The RewriteMap directive may not be used in sections or .htaccess files. You must declare the map in server or virtualhost context. You may use the map, once created, in your RewriteRule and RewriteCond directives in those scopes. You just can't declare it in those scopes.

Tags: Wordpress / .htaccess

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