import re
print(re.findall(r"([A-Z]\[[A-Z]\]\[[a-z]\])([A-Z]\[[a-z]+\])?", "A[B][q]G[boy]"))
print(re.findall(r"([A-Z]\[[A-Z]\]\[[a-z]\])([A-Z]\[[a-z]+\])?", "A[B][q]"))
aW1wb3J0IHJlCgpwcmludChyZS5maW5kYWxsKHIiKFtBLVpdXFtbQS1aXVxdXFtbYS16XVxdKShbQS1aXVxbW2Etel0rXF0pPyIsICJBW0JdW3FdR1tib3ldIikpCnByaW50KHJlLmZpbmRhbGwociIoW0EtWl1cW1tBLVpdXF1cW1thLXpdXF0pKFtBLVpdXFtbYS16XStcXSk/IiwgIkFbQl1bcV0iKSkK