tramp-file-name-regexp-separate 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 separate remoting.
XEmacs uses a separate filename syntax for Tramp and EFS.
See `tramp-file-name-structure' for more explanations.