Routing Question

[eluser]gungbao[/eluser]
new question:

Code:

$route['(.*)'] = "controllerA/actionA/$1";

does route anything to controllerA, actionA giving actionA-first parameter alle the $1.

this works wonderful for

domin.com/my-first-blog-entry
domin.com/my-second-blog-entry

...

now, I want to keep this rule for any-URL that does not match my controllerB
how can I negate controllerB from beeing matched from the route-rule?

Code:

$route['^(^controllerB)(.*)'] = "controllerA/actionA/$1";

won't work and i cannot find the correct posix-regex... stupid me

pls. could anyone help me?
greetings to all,
christoph