Your .htaccess file should have this content:

RewriteEngine On RewriteBase / RewriteRule /_([a-z][a-z])([/\.].*) /_$1$2 [R,L] RewriteRule ^_([a-z][a-z])/(.*) _$1.php?rewrite=1&url=$2 [L,E=THEQUERY:%{QUERY_STRING}]