Variable: tex-start-of-header
tex-start-of-header is a variable defined in tex-mode.el.gz.
Value
nil
Documentation
Regular expression used by M-x tex-region (tex-region) to find start of file's header.
Probably introduced at or before Emacs version 19.30.
Source Code
;; Defined in /usr/src/emacs/lisp/textmodes/tex-mode.el.gz
(defvar tex-start-of-header nil
"Regular expression used by \\[tex-region] to find start of file's header.")