Move text from prior file

[foosion]

I'm tweaking an ebook which is arranged as:

part1.xhtml /* contains chapter title */
chapter1.xhtml /* chapter text */
part2.xhtml /* contains chapter title */
chapter2.xhtml /* chapter text */
...

Is there an easy way to extract the title from its file and put it into the next file (the text file)? Search/replace does not appear to work across file boundaries.

It would be simple but not easy to do this manually.