how to redirect to index.php using htaccess code example

Example: htaccess route to index.php

RewriteEngine on
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^.*$ /index.php [L,QSA]


Using Sub directory:
RewriteRule ^.*$ /mvc/index.php [L,QSA]