Variable: ediff-metachars
ediff-metachars is a customizable variable defined in
ediff-init.el.gz.
Value
"[ \n!\"#$&'()*;<=>?[\\^`{|~]"
Documentation
Regexp matching characters that must be quoted with \ in shell command line.
This default should work without changes.
Source Code
;; Defined in /usr/src/emacs/lisp/vc/ediff-init.el.gz
;; Metacharacters that have to be protected from the shell when executing
;; a diff/diff3 command.
(defcustom ediff-metachars "[ \t\n!\"#$&'()*;<=>?[\\^`{|~]"
"Regexp matching characters that must be quoted with `\\' in shell command line.
This default should work without changes."
:type 'regexp
:group 'ediff)