website htaccess redirect conflict with wordpress

Solution:

To prevent the Rewrite loop, you can use the following :

RewriteEngine on
#stop internal redirection
RewriteCond %{ENV_REDIRECT_STATUS} 200
RewriteRule ^ - [L]
#Redirect /foo.html to /foo.php 
RewriteRule ^(.*?)\.html?$ /$1.php [L,R]

Replace both RedirectMatch and RewriteRule with the above Rules