org-repeat-re

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

"<[0-9]\\{4\\}-[0-9][0-9]-[0-9][0-9] [^>\n]*?\\([.+]?\\+[0-9]+[hdwmy]\\(/[0-9]+[hdwmy]\\)?\\)"

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

Documentation:
Regular expression for specifying repeated events.
After a match, group 1 contains the repeat expression.