Variable: dabbrev-case-fold-search
dabbrev-case-fold-search is a customizable variable defined in
dabbrev.el.gz.
Value
case-fold-search
Documentation
Control whether dabbrev searches should ignore case.
A value of nil means case is significant.
A value of case-fold-search means case is significant
if case-fold-search is nil.
Any other non-nil version means case is not significant.
Probably introduced at or before Emacs version 20.1.
Source Code
;; Defined in /usr/src/emacs/lisp/dabbrev.el.gz
(defcustom dabbrev-case-fold-search 'case-fold-search
"Control whether dabbrev searches should ignore case.
A value of nil means case is significant.
A value of `case-fold-search' means case is significant
if `case-fold-search' is nil.
Any other non-nil version means case is not significant."
:type '(choice (const :tag "off" nil)
(const :tag "like search" case-fold-search)
(other :tag "on" t))
:group 'dabbrev)