How can I remove files that do not contain the number 1 or ~1?

Question

I had to convert many .avi files.  The new names all contain ~1.  Those files I want to keep and remove the originals.  There are scripts to remove files with a numeral such as 1.  I need one to remove all files without the 1 or ~1. 
I tried using a script that removed older files, but the new files seemed to have the same created dates and modified dates so that will just delete all the files.

Answer 1

Thanks for your input.  I want to keep the files with a 1 or ~1 as it happens and delete the rest.  I have written some scripts.  I think I could write a script to delete all files with a 1, but of course that is not what I want.  I guess
I need a script to delete all files except if they contain a 1.  I haven't used a forum since way back in the PC mag days.
Whoops..........I just realized exactly what you were telling me and used your suggestion.  I guess I was trying to do more work than I needed.  I searched for all files with a 1 in the folder and then moved them to a different folder.  Then
I deleted the rest.  Job done.  Thanks for the help.