Extracting file extension (extname) from Text or String

Question

I have a `Text` or `String` containing a filename, say `/foo/bar/foobar.txt`. How can I defined a function `extname` (similar to NodeJS's extname, but omitting the leading dot) that only yields the extension (`txt` for the example?)

Accepted Answer

Another way would be to use `System.Filepath`:

```
λ> import System.FilePath
λ> snd $ splitExtension "/foo/bar/foobar.txt"
".txt"
```

You can also use `takeExtension` as pointed out by @kosmikus:

```
λ> takeExtension "/foo/bar/foobar.txt"
".txt"
```

Extracting file extension (extname) from Text or String

Solution

Problem