Variable: cua-enable-register-prefix
cua-enable-register-prefix is a customizable variable defined in
cua-base.el.gz.
Value
not-ctrl-u
Documentation
If non-nil, registers are supported via numeric prefix arg.
If the value is t, any numeric prefix arg in the range 0 to 9 will be
interpreted as a register number.
If the value is not-ctrl-u, using C-u (universal-argument) to enter a numeric prefix is not
interpreted as a register number.
If the value is ctrl-u-only, only numeric prefix entered with C-u (universal-argument) is
interpreted as a register number.
Source Code
;; Defined in /usr/src/emacs/lisp/emulation/cua-base.el.gz
(defcustom cua-enable-register-prefix 'not-ctrl-u
"If non-nil, registers are supported via numeric prefix arg.
If the value is t, any numeric prefix arg in the range 0 to 9 will be
interpreted as a register number.
If the value is `not-ctrl-u', using \\[universal-argument] to enter a numeric prefix is not
interpreted as a register number.
If the value is `ctrl-u-only', only numeric prefix entered with \\[universal-argument] is
interpreted as a register number."
:type '(choice (const :tag "Disabled" nil)
(const :tag "Enabled, but C-u arg is not a register" not-ctrl-u)
(const :tag "Enabled, but only for C-u arg" ctrl-u-only)
(other :tag "Enabled" t)))