Migrating (partially) from JSPs to Drupal: request advice on wildcard redirects from 'folder/*.jsp' to Drupal nodes

I have setup a new Drupal site at:

http://www.webel.com.au/

I have moved an old JSP site down to:

http://www.webel.com.au/oldjsp/ (it is now essentially down)

The new Drupal/PHP site - which exploits books heavily - has quite different structure, although many of the
Drupal aliases reflect to some degree the JSP folder structure, and so are suitable targets for catch-all redirects.

I am already gettings lots of Page Not Founds (mostly due to indexing robots I assume), both for images and for complex URLs such as:

http://www.webel.com.au/uml/parsing/index.jsp?page=wikipedia#particle

All up there are perhaps a few hundred such cases; some have clear targets on the new Drupal site, some don't. In most cases it would be sufficient to map from the JSP folder to an equivalent book branch in Drupal.

http://www.webel.com.au/uml/parsing_analysis (drupal alias)
http://www.webel.com.au/node/120 (same thing as drupal node url)

So a possible solution is to map - using wildcards - EVERY '*.jsp'
(and not all such pages are called 'index.jsp', and some have queries) from:

http://www.webel.com.au/uml/parsing/*/../*/*.jsp\??*=*
(my pretend wildcard regexp for all JSP under /uml/parsing/ physical folder)

http://www.webel.com.au/uml/parsing_analysis (Drupal PHP node)

If only I new how to do that easily !

Note however that I have other JSP sub-projects that are active and should work, so that I don't want to just remap ALL index.jsp on the entire site to the Drupal home page:

http://www.webel.com.au/nexml/index.jsp (works, self-contained)

I need to be able to do it per physical folder. And I will also need JSP anyway for other projects, I don't want to simply remap all JSPs.

I am already using the excellent Path Redirect module for individual cases, however I can't handle all cases like that.

I will trial the Search 404 tonight, it may at least help.

I have also been doing some Apache rewrite rules research tonight, and I do have access to the .htaccess on my host, so I would welcome advise on .htaccess rewrites, although I realise this may be beyond the scope of Drupal forums.

Very grateful for any advice or feedback,

Webel