Variable: footnote-numeric-regexp
footnote-numeric-regexp is a variable defined in footnote.el.gz.
Value
"[0-9]+"
Documentation
Regexp for digits.
Source Code
;; Defined in /usr/src/emacs/lisp/mail/footnote.el.gz
;;; Default styles
;;; NUMERIC
(defconst footnote-numeric-regexp "[0-9]+"
"Regexp for digits.")