Regex grammar for action mapping in Struts 1.x to map the URLs?

I know the documentation says, only (*) and escape seque开发者_如何转开发nce is supported. I want to differentiate between /somepath/category/subcategory and /somepath/category/article.html

I need to route both to different action handlers. I want to use wildcard characters in path mappings.

What is the best approach to do this?