Fails on paths that contain backslashes (`\`)

[JesseTG]

When using a build-directory input that contains a backslash, as is common on Windows, then the problem matcher will fail to install with a message similar to the following:

Run root-project/gcc-problem-matcher-improved@9d83f12b27a78210f0485fb188e08d94fa807a6d
  with:
    build-directory: D:\a\melonds-ds\melonds-ds/build
  env:
    BUILD_DIR: D:\a\melonds-ds\melonds-ds/build
    DIST_DIR: D:\a\melonds-ds\melonds-ds/build/dist
Error: Unable to process command '::add-matcher::D:\a\_actions\root-project\gcc-problem-matcher-improved\9d83f12b27a78210f0485fb188e08d94fa807a6d\dist/gcc_matcher.json' successfully.
Error: Bad JSON escape sequence: \a. Path 'problemMatcher[0].pattern[0].regexp', line 7, position 36.

[Axel-Naumann]

Thanks,I'll have a look! (We haven't used the problem matcher on Windows yet.)

[JesseTG]

Thank you for looking into this. Unfortunately the problem persists:

Prepare all required actions
Getting action download info
Download action repository 'root-project/gcc-problem-matcher-improved@f570674bcaf59d17ec0e6ae3ee0d03f8d68c1989' (SHA:f570674bcaf59d17ec0e6ae3ee0d03f8d68c1989)
Getting action download info
Run ./.github/actions/deps
  with:
    build-dir: D:\a\melonds-ds\melonds-ds/build
    ccache: sccache
    ccache-cache-name: melondsds_libretro-win32-x86_64-Release
    runs-on: windows-latest
  env:
    BUILD_DIR: D:\a\melonds-ds\melonds-ds/build
    DIST_DIR: D:\a\melonds-ds\melonds-ds/build/dist
Run root-project/gcc-problem-matcher-improved@f570674bcaf59d17ec0e6ae3ee0d03f8d68c1989
  with:
    build-directory: D:\a\melonds-ds\melonds-ds/build
  env:
    BUILD_DIR: D:\a\melonds-ds\melonds-ds/build
    DIST_DIR: D:\a\melonds-ds\melonds-ds/build/dist
Error: Unable to process command '::add-matcher::D:\\a\\_actions\\root-project\\gcc-problem-matcher-improved\\f570674bcaf59d17ec0e6ae3ee0d03f8d68c1989\\dist\\gcc_matcher.json' successfully.
Error: Bad JSON escape sequence: \a. Path 'problemMatcher[0].pattern[0].regexp', line 7, position 36.

[Axel-Naumann]

Well, thank you for trying! Next I will try with forward slashes; if that still doesn't work I'll try with twice the amount of backslashes. It's gotta be possible somehow :-) Bear with me, please! And thanks for your feedback!

[JesseTG]

No problem, thanks for the useful tool!