import re
regex = r"^([a-zA-Z]:)\\(?:.*\\)?(\d{2}-\d{2}-\d{4}[a-zA-Z]?)"
text = r"Q:\Region01s\FY 02\02-01-1716A.pdf"
match = re.search(regex, text)
if match:
print(f"{match.group(1)} {match.group(2)}")
aW1wb3J0IHJlCnJlZ2V4ID0gciJeKFthLXpBLVpdOilcXCg/Oi4qXFwpPyhcZHsyfS1cZHsyfS1cZHs0fVthLXpBLVpdPykiCnRleHQgPSByIlE6XFJlZ2lvbjAxc1xGWSAwMlwwMi0wMS0xNzE2QS5wZGYiCm1hdGNoID0gcmUuc2VhcmNoKHJlZ2V4LCB0ZXh0KQppZiBtYXRjaDoKICAgIHByaW50KGYie21hdGNoLmdyb3VwKDEpfSB7bWF0Y2guZ3JvdXAoMil9Iik=