I cannot specifically find this stated in either AWS S3 or Camel documentation, but it appears that I can give a prefix 1234- to restrict Camel's (4.3.0) downloads to files starting 1234-, but cannot give a prefix ????- to restrict Camel's downloads to files beginning with four characters and a hyphen.
I believe AWS CLI does provide a way to do this. If I'm correct, it would be helpful if this could be added to the documentation. If someone were to want to instruct me in where/how to do that, I'd be happy to generate a pull request, but it might be easier to just add: "Note: due to AWS S3 limitations, the prefix parameter does not work with wildcards." It would be even more helpful, of course, if the component were modified in some way to allow for wildcards.
