Variable: todo-done-string-start
todo-done-string-start is a variable defined in todo-mode.el.gz.
Value
"^\\[DONE "
Documentation
Regular expression matching start of done item.
Source Code
;; Defined in /usr/src/emacs/lisp/calendar/todo-mode.el.gz
(defconst todo-done-string-start
(concat "^\\[" (regexp-quote todo-done-string))
"Regular expression matching start of done item.")