org-footnote-re

org-footnote-re is a variable defined in `org-footnote.el'.
Its value is

"\\[\\(?:fn:\\([-_[:word:]]+\\)?:\\|\\(?:\\([0-9]+\\)\\]\\)\\|\\(fn:[-_[:word:]]+\\)\\)"

• This variable may be risky if used as a file-local variable.

Documentation:
Regular expression for matching footnotes.