Wildcard Url

[eluser]Unknown[/eluser]
Hi i am trying to add more parameters to my rewrittten urls, suppose i have.

Code:

example.com/books/book-name

book-name is the slug.

What do i need to do to add an extra segment to the url also keeping the slug i.e.

Code:

example.com/books/book-name/chapter-1

could even be (example.com/book-name/chapter-1)

1 would be another query parameter. Because book-name isnt a view, how do I keep the slug in the url always with different book names and append another query parameter?

I am totally new to codeigniter.
Any help would be appreciated thanks.