Old apache redirects ---> Nginx redirects

I have moved my forum from apache to nginx. It's working great but there's one thing i d like to fix.
My old rewrite rules are not working now. There are still a lot of extarnal links to my forum and they get 404's now.

What's the best way to solve this?

Thanks for your help!!
Ralf

Code:

<IfModule mod_rewrite.c>
    RewriteEngine On
    # MattW
    RewriteRule ^about([0-9]+)\.html /Forum/topic/$1/ [L,R=301,NC]
    RewriteRule ^(.*)\-t([0-9]+)\.html /Forum/topic/$2/ [L,R=301,NC]...

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