(defcustom message-cite-prefix-regexp
;; ?-, ?_ or ?. MUST NOT be in syntax entry w.
- "[ \t]*\\(\\(\\w\\|[-_.]\\)+>+[ \t]*\\|[]>»|:}+][ \t]*\\)+"
+ "\\([ \t]*\\(\\w\\|[-_.]\\)+>+\\|[ \t]*[]>»|:}+]\\)+"
"*Regexp matching the longest possible citation prefix on a line."
:group 'message-insertion
:type 'regexp)