Is it possible to get items from DynamoDB where the primary key ends with a given string?

Is it possible, using the AWS Ruby SDK (or just DynamoDB in general), to get an item or items from a table that uses a primary key only, and where that primary key ends with a certain string?

I haven't come across anything in the docs that explicitly answers this question, either in the ruby ddb docs or the general docs for ddb. I'm not saying the question is not answered, but if it is, I can't find it.

If it is possible, could someone provide an example for ruby or link to the docs where an example exists?