If the folder structure is:

parentFolder
├── file1.rtf
├── file2.rtf
├── moreFiles.rtf
├── subFolder1
└── subFolder2

How would I delete subFolder1, but not subFolder2 or any of the files without specifying the file names? Specifying folder names is ok.

I know you could specify each folder and file not to be deleted:

rm -r !("file1.rtf"|"file2.rtf"|"subFolder1")

But I would prefer not to have name each file.