Variable: message-subject-re-regexp

message-subject-re-regexp is a customizable variable defined in message.el.gz.

Value

"^[     ]*\\([Rr][Ee]\\(\\[[0-9]*\\]\\)* ?:[    ]*\\)*[         ]*"

Documentation

Regexp matching "Re: " in the subject line.

Source Code

;; Defined in /usr/src/emacs/lisp/gnus/message.el.gz
(defcustom message-subject-re-regexp
  "^[ \t]*\\([Rr][Ee]\\(\\[[0-9]*\\]\\)* ?:[ \t]*\\)*[ \t]*"
  "Regexp matching \"Re: \" in the subject line."
  :group 'message-various
  :link '(custom-manual "(message)Message Headers")
  :type 'regexp)