How to get the base directory in visual studio code snippet?

Question

I am trying to get the file current directory in a snippet for visual studio code.

VSCode has a variable: TM_DIRECTORY, which is the fullpath

Answer 1

Ok, finally found it.

${TM_DIRECTORY/^.+\\/(.*)$/$1/} gives the base directory.

The part I didn't get was the "double escape" of the directory separator / -> \\/.