Variable: org-clock-drawer-start-re
org-clock-drawer-start-re is a variable defined in org.el.gz.
Value
"^[ ]*:CLOCK:[ ]*$"
Documentation
Regular expression matching the first line of a clock drawer.
Source Code
;; Defined in /usr/src/emacs/lisp/org/org.el.gz
(defconst org-clock-drawer-start-re "^[ \t]*:CLOCK:[ \t]*$"
"Regular expression matching the first line of a clock drawer.")