> ... I'll post the code below (the good thing about posting code is that if you make a mistake, someone will point it out!).

I didn't find a mistake, but there are a few details which I would code different - consider this my personal preferences.

If i#nDeviceline and i#nOutputLine and i#nDriverline

To avoid repeating the variable, "i", I would write this as:

if not inlist(i, nDeviceLine, nOutputLine, nDriverLine)

And in:

m.NewExpr=m.NewExpr + mline(expr,i) +chr(013)

I consider it safer to use the "official" end-of-line delimiter: chr(13) + chr(10).


Finally,

Replace expr with m.NewExpr
Replace tag WITH ""
Replace tag2 WITH ""

I suspect this might execute a little faster with a single replace command:

replace;
  expr with m.NewExpr,;
  tag  with ""
  tag2 with ""