reb-auto-update

reb-auto-update is a compiled Lisp function in `re-builder.el'.

(reb-auto-update BEG END LENOLD &optional FORCE)

Called from `after-update-functions' to update the display.
BEG, END and LENOLD are passed in from the hook.
An actual update is only done if the regexp has changed or if the
optional fourth argument FORCE is non-nil.