texinfo-section-types-regexp

texinfo-section-types-regexp is a variable defined in `texnfo-upd.el'.
Its value is

"^@\\(chapter \\|sect\\|subs\\|subh\\|unnum\\|major\\|chapheading \\|heading \\|appendix\\)"

Documentation:
Regexp matching chapter, section, other headings (but not the top node).