Vim Multi-line search pattern

Question

I have a substitute command that captures and displays submatch() values in the replacement string. But I have another line of information that I want to parse below this line. That line is always the first line after an empty line, though the number of lines TO that empty line varies. For example:

The first important line I want to capture is here
Stuff I don't want.
A few more lines of stuff I don't want...

Second line I want to capture.

This pattern repeats a hundred or so times in a document. I can substitute "The First Important Line" fine, but shouldn't that search pattern include a way to jump down to the first empty line and then pick up the next "Second line I want to capture." ?? I could then place the contents of that second line into submatch parenthesis and substitute them where needed (right?).

If so, I cannot discover the way to extend the first search pattern to capture the "Second line" Suggestions or correcting my approach would be greatly appreciated.

Answer 1

I think I read about offsets, but I can't find the bit in the help that is relevant right now. As such, my other solution would be to record a macro to do what you want:

qa/[Your pattern]<CR>jddq

You could then execute this macro with @a and repeat with @@; or run it a lot of times (e.g., 999@a).