Question about filter-mappings in the web.xml

I'm a bit new this so apologies if this is a stupid question but want to write a filter mapping that captures /image/<identifier here> and /image/<identifier here>/size/<size here>
I would have assumed <url-pattern>/image/*</url-pattern> would do this but it doesn't. When I try a URL with /size/ in it, I get a File not found error.
So I tried adding a second mapping that uses <url-pattern>/image/*/size/*</url-pattern> and that doesn't work either.
What would be the best way to write a filter mapping that captures both /image/<identifier here> and /image/<identifier here>/size/<size here> ?

Thanks for the reply.
I did end up doing something like that in the end. I think I just couldn't get my mind into gear as usual on Monday.
What's happening is taking a nice neat human readable URL and converting it to the horrible URL used by the system. The reason it's a filter is because someone had written a tiny filter would might only execute 20 lines of code and I think someone felt it was easier to just lump about 240 more lines to execute on each request, which, even if it isn't a huge strain on the system it's nasty and most of the code is unnecessary the vast majority of the time. I'm splitting it up the whole lot based on the various tasks.
This particular functionality could be a servlet. I probably would have done it that if given the task from scratch but I think sometimes I put too much faith in the fact those with more experience should know better. I think I'll try it as a servlet and if someone has concerns about it then I'll ask them to explain to me why it can't be one.

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