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How to batch rename files by exchanging substrings in the filenames?
I have files like ABC_asd_f.txt, DEF_qwe_r.txt, ...
How can I exchange the uppercases before the first underscore with the lowercases after? So ABC_asd_f.txt becomes asd_f_ABC.txt, DEF_qwe_r.txt becomes qwe_r_DEF.txt, ...
