Variable: outline-regexp
outline-regexp is a variable defined in outline.el.gz.
Documentation
Regular expression to match the beginning of a heading.
Any line whose beginning matches this regexp is considered to start a heading.
Note that Outline mode only checks this regexp at the start of a line,
so the regexp need not (and usually does not) start with ^.
The recommended way to set this is with a Local Variables: list
in the file it applies to. See also outline-heading-end-regexp.
Probably introduced at or before Emacs version 18.
Source Code
;; Defined in /usr/src/emacs/lisp/outline.el.gz
(defvar outline-regexp "[*\^L]+"
"Regular expression to match the beginning of a heading.
Any line whose beginning matches this regexp is considered to start a heading.
Note that Outline mode only checks this regexp at the start of a line,
so the regexp need not (and usually does not) start with `^'.
The recommended way to set this is with a Local Variables: list
in the file it applies to. See also `outline-heading-end-regexp'.")