> how do you change the way emacs selects regions of text? Currently
> line based, but I need to select a rectangular region from within
> Can anyone help me with how to change the selection mode?
What you are looking for is rectangle editing.
Define a rectangle in the usual way (mark upper left
corner, then move to bottom right plus one).
Then use the commands kill-rectangle delete-rectangle yank-rectangle clear-rectangle open-rectangle