Javascript replacing double backslashed with single backslash

I have been browsing lots of solutions, but somewhy haven't got anything to work.

I need to replace following string: "i:0#.w|dev\\tauri;" with "i:0#.w|dev\tauri;"

I have tried following JS codes to replace:

s.replace(/\\\\/g, "\\$1");

s.replace(/\\\\/g, "\\");

But have had no result. Yet following replaced my \\ with "

s.replace(/\\/g, "\"");

To be honset, then I am really confused behind this logic, it seems like there should be used \\\\ for double backshashed yet it seems to work with just \\ for two backshashes..

I need to do this for comparing if current Sharepoint user (i:0#.w|dev\tauri) is on the list.