Variable: mail-citation-prefix-regexp
mail-citation-prefix-regexp is a customizable variable defined in
sendmail.el.gz.
Value
"\\(?:[ ]*\\(?:[[:word:]_.]+>\\|[>|]\\)\\)+"
Documentation
Regular expression to match a citation prefix plus whitespace.
It should match whatever sort of citation prefixes you want to handle,
including leading whitespace. The default value matches citations
like foo_bar> plus any leading whitespace.
This variable was added, or its default value changed, in Emacs 24.1.
Source Code
;; Defined in /usr/src/emacs/lisp/mail/sendmail.el.gz
;;;###autoload
(defcustom mail-citation-prefix-regexp
;; Use [:word:] rather than \w so we don't get tripped up if one
;; of those chars has a weird `syntax-table' text property.
;; FIXME: Merge with `message-cite-prefix-regexp'.
"\\(?:[ \t]*\\(?:[[:word:]_.]+>\\|[>|]\\)\\)+"
"Regular expression to match a citation prefix plus whitespace.
It should match whatever sort of citation prefixes you want to handle,
including leading whitespace. The default value matches citations
like `foo_bar>' plus any leading whitespace."
:type 'regexp
:version "24.1")