tramp-file-name-regexp-unified is a variable defined in `tramp.el'.
Its value is
"\\`/[^/|:][^/|]*:"
This variable may be risky if used as a file-local variable.
Documentation:
Value for `tramp-file-name-regexp' for unified remoting.
Emacs (not XEmacs) uses a unified filename syntax for Ange-FTP and
Tramp. See `tramp-file-name-structure' for more explanations.
On W32 systems, the volume letter must be ignored.