What regex can isolate the directory hierarchy from a path?

Question

Say you have a path that can be one of:

1. Foo/Bar/Baz.txt (a directory hierarchy followed by a file containing a single dot)
2. Foo/Bar/ (a directory hierarchy ending in a trailing slash)
3. Foo/Bar (a directory hierarchy that does not end with a trailing slash)

What's an effective regex to capture just the directory hierarchy from paths like these, resulting in capturing just Foo/Bar ?

Answer 1

EDIT:

^(.*?)(?:/(?:[^/.]*\.[^/.]+)?)?$