Variable: tramp-autoload-file-name-regexp
tramp-autoload-file-name-regexp is a variable defined in tramp.el.gz.
Value
"\\`/\\(?:-\\|[^/:|]\\{2,\\}\\):"
Documentation
Regular expression matching file names handled by Tramp autoload.
It must match the initial tramp-syntax settings. It should not
match file names at root of the underlying local file system,
like "/sys" or "/C:".
Source Code
;; Defined in /usr/src/emacs/lisp/net/tramp.el.gz
;;;###autoload
(defconst tramp-autoload-file-name-regexp
;; The method is either "-", or at least two characters.
(rx bos "/" (| "-" (>= 2 (not (any "/:|")))) ":")
"Regular expression matching file names handled by Tramp autoload.
It must match the initial `tramp-syntax' settings. It should not
match file names at root of the underlying local file system,
like \"/sys\" or \"/C:\".")