Speedbar question

[John Wilde]

I would like to use the speedbar for a custom file type and define a
regular expression that determines the line in the file to jump to.  i
am able to run etags to create the TAGS file that I want, but how do I
make this work with speedbar so that it will expand into a list?
(Like, for example, the way functions are listed when a .cpp file is
opened)

thank you!

-john