Variable: speedbar-directory-unshown-regexp
speedbar-directory-unshown-regexp is a customizable variable defined
in speedbar.el.gz.
Value
"^\\(\\..*\\)\\'"
Documentation
Regular expression matching directories not to show in speedbar.
They should include commonly existing directories which are not
useful. It is no longer necessary to include version-control
directories here; see vc-directory-exclusion-list.
Source Code
;; Defined in /usr/src/emacs/lisp/speedbar.el.gz
(defcustom speedbar-directory-unshown-regexp "^\\(\\..*\\)\\'"
"Regular expression matching directories not to show in speedbar.
They should include commonly existing directories which are not
useful. It is no longer necessary to include version-control
directories here; see `vc-directory-exclusion-list'."
:group 'speedbar
:type 'regexp)