For some reason, I can create files with '\' symbols despite the regex is `[a-zA-Z_\\-.0-9/]+` [code](https://github.com/kureduro/tsuki/blob/32c6cdc14ec05a20efbff17c5069813d37145c11/cmd/tsukinsd/filetree.go#L406)
For some reason, I can create files with '' symbols despite the regex is
[a-zA-Z_\\-.0-9/]+code