org-occur-parameters

org-occur-parameters is a variable defined in `org.el'.
Its value is

nil

• Automatically becomes buffer-local when set.

Documentation:
Parameters of the active org-occur calls.
This is a list, each call to org-occur pushes as cons cell,
containing the regular expression and the callback, onto the list.
The list can contain several entries if `org-occur' has been called
several time with the KEEP-PREVIOUS argument. Otherwise, this list
will only contain one set of parameters. When the highlights are
removed (for example with `C-c C-c', or with the next edit (depending
on `org-remove-highlights-with-change'), this variable is emptied
as well.