soup.io is closing today, yet after all I'm getting my assets. I'm at 7400/12680, it should take no longer than an hour to finish. I hope to get them all before soup goes down. I have 27798 assets total, but in earlier years I was in the habit of saving the assets to my computer whenever I reposted something. For this, I ignored the first group of '^([0-9]{4,5}/)([0-9a-f]{4}_[0-9a-f]{4})(?:_(?:[0-9]{3}|(?:16|32)-square))?(\.\w{2,6})$', but I just hope that there are no collisions.
edit: it's done now, only 160 of my assets are 404