Here is a workflow for bulk renaming files.
You select some files either in Alfred using the File Navigator or the File Buffer and use the File Action called "Rename with BulkRename", or select the files in Finder and use the hotkey to trigger the workflow for the selected files.
Once triggered, Alfred will display a preview option and a bunch of preset actions that you can select. The preview option will display the modifications that will be made for each preset action listed.
Preview
Here are a couple of snapshot portions of what you see when pressing the Shift key: