htaccess redirect index.html to index.php for domain root only

Question

I have a htaccess rule which redirects the index.html to index.php

  RewriteCond %{THE_REQUEST} ^[A-Z]{3,9}\ /.*index\.html\ HTTP/
  RewriteRule ^(.*)index\.html$ /$1index.php [R=301,L]

This works fine - when I call http://mydomainname.com/index.html , it redirects me to http://mydomainname.com/index.php

but I got one problem, when there is a file in subfolder named index.html then my htaccess rule takes that to index.php.

Example - http://mydomainname.com/subfolder/index.html to http://mydomainname.com/subfolder/index.php and this should not happen for subfolders.

Any solution?

Answer 1

That rule is probably a bit over-complicated for what you're doing.

You only need:

RewriteRule ^index.html$ /index.php [R,L]