File renaming: no undo, no original, no go back?

Question

Ugh, I renamed and don't like it.  There is no edit>undo rename.
I wish I could just start over.  There is no "original filename" choice.
"Preserved filename" is now the new stuff.
I wanted a sequence numbering on the original file name
so flash could interpret the items as a sequence and bring them all in for me
in key frames, for a slide show, no work.  Instead, the sequence numbering went
on the end of the file name without a " - ".
The original file names are the camera numbers so there is really no apparent sequence.
Now I gotta rename every one individually?

Answer 1

When you rename one file you can use the cmd Z to undo, for batch renaming
this is not working. You can use batch renaming (tools/batch rename) for
renaming multiple files to what ever you want. Use the plus signs to create
more optionfields, like date created / current filename or a text field with
whatever you want / sequence number etc. etc.
There are almost unlimited ways to rename.
Mind that you should stay with the alphabet and - or _ sign, the dot (.) is
only used in front of the file extension and a comma or an empty space is
also not a good idea
In Bridge you can select the multiple files and use a filter method for date
created, size, dimension in ascending or descending order.
You may even place them manually in the right order. Then go to batch rename
end use a sequel number with 2 or more digit depending on the amount of
files.
The option preserve filename put's the last name in the Exif data but you
cant extract them (at least not that I know of) in an easy way. But as said,
you can rename them every time again using batch renaming, it is very easy
to use and very useful once you have discovered the power of its function
The original file names are the camera numbers so there is really no apparent
sequence.
Now I gotta rename every one individually?