Ignore folder pattern does not work when folder has subfolders

[webpolis]

Describe the bug

The exclamation mark in the glob pattern is used to exclude some path names from being validated, however it is not working as expected. The projects._index folder in my repo is not ignored, thus eslint gives an error, while the users._index folder is correctly ignored.

I guess this issue may be related with the projects._index folder containing sub folders.

  1:1  error  The folder "projects._index" does not match the "SNAKE_CASE" pattern  check-file/folder-naming-convention

Expected behavior
Ignore all folders matching the ignore pattern

Plugin configuration

      "check-file/folder-naming-convention": [
        "error",
        {
          "app/**/!(_index|[a-z_]+._index|[a-z_]+.$[a-z_]+)/": "SNAKE_CASE"
        }
      ],

I tried as well by adding a * at the end but that makes the others fail as well:

app/**/!(_index|[a-z_]+._index|[a-z_]+.$[a-z_]+)/*

Project structure

app/routes/
├── _index
│   └── route.tsx
├── projects._index
│   ├── new
│   │   └── route.tsx
│   └── route.tsx
└── users._index
    └── route.tsx

[dukeluo]

how about this one?

    "check-file/folder-naming-convention": [
      "error",
      {
        "app/**/!(*._index)": "SNAKE_CASE"
      }
    ],