Beginner question: I am trying to rename all .xlsx files within a directory. I understand how to replace a character in string with another, but how about removing? More specifically, I have multiple files in a directory: 0123_TEST_01, 0456_TEST_02. etc. I am trying to remove the prefix in the file name, which would result in the following: TEST_01, TEST_02.Beginner question: I am trying to rename all .x