s3 Glacier Transition

S3 lifecycle is based on Tag or Prefix. So whatever folders or root objects, we need to find the pattern of root objects names and put a lifecycle for it.
If there's too much diversity in the pattern of root objects names, what about create a list of root objects excluding specified "folder" prefix. After tagging these objects, put a lifecycle for the Tag to transfer these objects to Glacier.
Also mentioning that S3 doesn't have real folders:

e.g. bucket/--
/abc.txt
/abc.jpg
/a/abc.jpg
/a/abcd.exif
We just need to create a lifecycle for prefix "abc", then the root files started with abc will be transitioned to Glacier.

e.g. bucket/--
/abc.txt
/abc.jpg
/abc/abc.jpg
/abc/abcd.exif
If we have patterns like these, we can create the lifecycle with prefix "abc." for lifecycle or we can create a list of files excluding "abc/" and use the list for S3 batch to add Tags for these objects. Finally we put a lifecycle for the Tag.