Invalid character escape '\P' when building

[citystrawman]

Describe the bug
When executing cmake .., I got error messages:

CMake Error at D:/Program Files/CMake/share/cmake-3.23/Modules/FindCUDA.cmake:904 (message):
  Syntax error in cmake code at

    D:/Program Files/CMake/share/cmake-3.23/Modules/FindCUDA.cmake:904

  when parsing string

    CUDA_NVCC_EXECUTABLE;NAMES;nvcc;PATHS;C:C:\Program Files\NVIDIA GPU Computing Toolkit\CUDA\v11.7;ENV;CUDA_PATH;ENV;CUDA_BIN_PATH;PATH_SUFFIXES;bin;bin64;NO_DEFAULT_PATH

  Invalid character escape '\P'.
Call Stack (most recent call first):
  D:/Program Files/CMake/share/cmake-3.23/Modules/FindCUDA.cmake:917 (cuda_find_host_program)
  D:/software/vcpkg/scripts/buildsystems/vcpkg.cmake:859 (_find_package)
  CMakeLists.txt:114 (FIND_PACKAGE)

Then I checked the FindCUDA.cmake file, and in order to see what is going on, I use message() to see the variables:

and the corresponding results are as follows:

it should be the windows directory separator conflicts with the default separator, I tried to change my environment variable CUDA_PATH from C:\Program Files\NVIDIA GPU Computing Toolkit\CUDA\v11.7 to C:/Program Files/NVIDIA GPU Computing Toolkit/CUDA/v11.7 but I still got the same issues, which might suggest that the incorrect string is not received from CUDA_PATH , but some else variable(but I could not find).

I appreciate if anyone could help solve this issue, thanks.

Desktop (please complete the following information):

• OS: windows 10
• Browser [e.g. chrome, safari]
• Version [e.g. 22]

Additional context
Now I changed FIND_PACKAGE(CUDA) by specifying its path: FIND_PACKAGE(CUDA PATHS "D:/Program Files/CMake/share/cmake-3.23/Modules/FindCUDA.cmake") and now the previous erro has gone, but now here's a new problem: it still could npt find CUDA:

[citystrawman]

this can be solved by adding SET(CUDA_TOOLKIT_ROOT_DIR "C:/Program Files/NVIDIA GPU Computing Toolkit/CUDA/v11.7")