Insert the content of a file (with command r?)

Hi,

I'd like to insert the content of a file when the input matches some regexp.
It tried this simple script: /regexp/r file.txt
It works fine, except that it's inserting the content of the file
after the line matching the regexp. I'd like to insert it BEFORE
instead.


-- input:
1
2
insert here
3
4

-- file.txt:
hello

-- script:
/here/r file.txt

-- output:
1
2
insert here
hello
3
4

-- desired output:
1
2
hello
insert here
3
4

By playing with the hold space, I managed to make it work for the
example, but it fails when the regexp in the first or the last line of
the file. Any suggestion? My current workaround is to use the "i"
command, but it's not as convenient. I don't really like the way "r"
works, it seems like it would be much more useful if it used the
pattern space like most commands.

-- 
  Laurent