RewriteEngine on
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ contact.php?username=$1 [QSA,L]
RewriteRule ^confirm/([0-9a-zA-Z-_]+) contact.php?username=$1 [L,QSA]
RewriteCond %{SERVER_PORT} 80
RewriteRule ^.*$ https://%{SERVER_NAME}%{REQUEST_URI} [R=301,L]