Variable: tramp-domain-regexp
tramp-domain-regexp is a variable defined in tramp.el.gz.
Value
"[._[:alnum:]-]+"
Documentation
Regexp matching domain names.
Source Code
;; Defined in /usr/src/emacs/lisp/net/tramp.el.gz
(defconst tramp-domain-regexp (rx (+ (any "._-" alnum)))
"Regexp matching domain names.")