Robust redirect options

Currently, I believe the module only redirects to a string value and no processing is performed on the string prior to redirection. It would be great if the module had more robust options for the redirects, such as regular expression replacement, token replacement, etc.

An example of a use case would be when one has a group of pages for each instance of a content type

animals/dog/description
animals/dog/pictures
animals/cat/description
animals/cat/pictures

There is a context set for the user's favorite animal (e.g. dog or cat).

There are also placeholder pages used for the navigation which also provide some generic data and allows the user to set their context

animals/default/description
animals/default/pictures

In this case, when someone arrives to one of the default pages with their context already set, the site would automatically redirect them to the proper page for that animal. If dog is set, then

animals/default/pictures => animals/dog/pictures

In terms of a regular expression then, the redirect would need to match

animals/default/(.*)

and go to

animals/{context}/$1

where {context} is the value of the context and $1 is the match group from the regular expression.

I scanned the source code and there doesnt seem to be anything approaching this level of granularity. This would be super helpful.