C++ include guard VS Code snippet: replace special characters with _, make upper case

cpp-include-guard.code-snippets

{
  "New C++ header": {
    "prefix": "newh",
    "body": [
      // VS Code snippets do not support recursive replacements so we must be
      // creative: replace segments like `foo/`, `bar.` and `h<eos>` to `FOO_`,
      // `BAR_` and `H_` such that `foo/bar.h` becomes `FOO_BAR_H_`.

      "#ifndef PROJECT_${RELATIVE_FILEPATH/(\\w+)(?:\\.|\\/|$)/${1:/upcase}_/g}",
      "#define PROJECT_${RELATIVE_FILEPATH/(\\w+)(?:\\.|\\/|$)/${1:/upcase}_/g}",
      "",
      "namespace project {",
      "",
      "$0",
      "",
      "}  // namespace project",
      "",
      "#endif  // PROJECT_${RELATIVE_FILEPATH/(\\w+)(?:\\.|\\/|$)/${1:/upcase}_/g}"
    ],
    "isFileTemplate": true,
    "scope": "cpp",
  },
}