Deleting multiple S3 objects by wildcard

[indreksiitan]

Can anyone enlighten me on what is the correct call syntax to delete multiple objects at once in the S3 client? I've tried all I could imagine from common sense and reading the source, but nothing works. I either get an error message (that "Objects" or "Delete" parameters are required - and cannot understand from the code what they should contain exactly) or no error, but nothing deleted. Deleting a single object using Bucket and Key parameters works fine.