no me funciona el if

[engonga]

YA LO SOLUCIONE

Código PHP:

  RewriteEngine On
RewriteCond   %{REQUEST_URI} /([0-9a-z]{6})$ [NC]
RewriteRule   ^(.*) http://an-a.es//forward.php?%1 [S]
RewriteCond   %{REQUEST_URI} /(_.*)$ [NC]
RewriteRule   ^(.*) http://an-a.es//forward2.php?%1 [L]