RewriteEngine On
RewriteBase /~sql/dev/

RewriteCond %{REQUEST_URI} ^.*/do/(.+)$
RewriteRule ^do/(.+)$ $1.php [L,QSA]

RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule .* do/index [R,L,QSA]

RewriteCond %{THE_REQUEST} !^(GET|POST)\ /.+do/.+\ HTTP
RewriteCond %{REQUEST_FILENAME} !\.html$
RewriteCond %{REQUEST_FILENAME} !\.css$
RewriteCond %{REQUEST_FILENAME} !\.jpg$
RewriteRule .* do/index [R,L,QSA]