is a variable defined in `
Its value is
- Automatically becomes buffer-local when set.
Regular expression to match a heading line prefix for a particular depth.
This expression is used to search for depth-specific topic
headers at depth 2 and greater. Use `allout-depth-one-regexp'
for to seek topics at depth one.
This var is set according to the user configuration vars by
`set-allout-regexp'. It is prepared with format strings for two
decimal numbers, which should each be one less than the depth of the
topic prefix to be matched.