Variable: allout-regexp
allout-regexp is a buffer-local variable defined in allout.el.gz.
Documentation
Regular expression to match the beginning of a heading line.
Any line whose beginning matches this regexp is considered a
heading. This var is set according to the user configuration vars
by allout-set-regexp.
Source Code
;; Defined in /usr/src/emacs/lisp/allout.el.gz
;;;_ : Topic header format
;;;_ = allout-regexp
(defvar-local allout-regexp ""
"Regular expression to match the beginning of a heading line.
Any line whose beginning matches this regexp is considered a
heading. This var is set according to the user configuration vars
by `allout-set-regexp'.")