You can create redirect rules based on the syntax of Java regular expressions directly through the CMS via "System » Redirect".

Here are some examples which show you the main idea:

If you rename the folder "coffeeklatsch" to "blog" and want all content to be redirect accordingly, you can use the following rule:

Source: /coffeeklatsch/?(.*)
Target: /blog/$1

If you want to redirect a page called /google to google.com, you can use:

Source: /google
Target: http://www.google.com/

If you want to enable the context editing feature (switching from public site to CMS with context of current path) by simlpy adding a ! to any path, you can use the following rule:

Source: (.*)!
Target: /cms?$1