mouse-buffer-menu-mode-groups

mouse-buffer-menu-mode-groups is a variable defined in `mouse.el'.
Its value is shown below.

Documentation:
How to group various major modes together in .
Each element has the form (REGEXP . GROUPNAME).
If the major mode's name string matches REGEXP, use GROUPNAME instead.

Value:

(("Info\\|Help\\|Apropos\\|Man" . "Help") ("\\bVM\\b\\|\\bMH\\b\\|Message\\|Mail\\|Group\\|Score\\|Summary\\|Article" . "Mail/News") ("\\" . "C") ("ObjC" . "C") ("Text" . "Text") ("Outline" . "Text") ("\\(HT\\|SG\\|X\\|XHT\\)ML" . "SGML") ("log\\|diff\\|vc\\|cvs\\|Annotate" . "Version Control") ("Threads\\|Memory\\|Disassembly\\|Breakpoints\\|Frames\\|Locals\\|Registers\\|Inferior I/O\\|Debugger" . "GDB") ("Lisp" . "Lisp"))