Variable: org-footnote-re
org-footnote-re is a variable defined in org-footnote.el.gz.
Value
"\\[fn:\\(?:\\(?1:[-_[:word:]]+\\)?\\(:\\)\\|\\(?1:[-_[:word:]]+\\)\\]\\)"
Documentation
Regular expression for matching footnotes.
Match group 1 contains footnote's label. It is nil for anonymous footnotes. Match group 2 is non-nil only when footnote is inline, i.e., it contains its own definition.
Source Code
;; Defined in /usr/src/emacs/lisp/org/org-footnote.el.gz
;;;; Constants
(defconst org-footnote-re
"\\[fn:\\(?:\\(?1:[-_[:word:]]+\\)?\\(:\\)\\|\\(?1:[-_[:word:]]+\\)\\]\\)"
"Regular expression for matching footnotes.
Match group 1 contains footnote's label. It is nil for anonymous
footnotes. Match group 2 is non-nil only when footnote is
inline, i.e., it contains its own definition.")