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I am sorry for not explaining clearly. How do i identify the file? It changes names after each download. I need to use regex for the path to file.

I have a file that generates some type of key dynamically that I want to download and then rename. I can find it through regex, but do not know the proper syntax to rename it. For instance it is in the format ABCD-1234-123456.csv. Only the middle digits and dash change. How, do I enter regex...