The regulator is riveted onto the inner door skin.  Easy enuff to
drill out.  Where the regulator hooks onto the window's bottom frame
is easy to get out with a bit of sliding back and forth of the
regulator.   Getting a new replacement may be worth more that the car,
getting a used replacement at a wrecker means doing the removal twice.
See what you need for tools to get yours out and take those tools to a
wrecker if they don't already have one out for you.

Repairing the broken regulator is possible, but may not be cost
effective in time and resources and may not wok as well as a
replacement.

Replacing the rivets may be a big issue but most body shops would
likely hae the materials and or tools needed.  Or you could use small
machine screws and nuts.

P