urlmanager rules replace backslash?

I need to pass the page parameter into seo-friendly url. Currently,we can have

Notice I replace  "/" with "_", but the "/*" will automatically add "/"again.

For example, I want:

instead of:

Is it possible to replace / with a customized letter such as "_" in the configuration file?

Remove '/*' from your pattern because it indicates other GET params should be appended using path format.

I just did it. Will try to figure out a way to replace the Get format.