org-re-timestamp
org-re-timestamp is a compiled Lisp function in `org.el
'.
(org-re-timestamp TYPE)
Return a regexp for timestamp TYPE.
Allowed values for TYPE are:
all: all timestamps
active: only active timestamps (<...>)
inactive: only inactive timestamps ([...])
scheduled: only scheduled timestamps
deadline: only deadline timestamps
closed: only closed time-stamps
When TYPE is nil, fall back on returning a regexp that matches
both scheduled and deadline timestamps.