The regex queries you want are in the Bitcoin tests GitHub repo

dollarparity

to run it, use:

chmod +x search.sh
./search.sh

clarity

plug it in and try the bash script in this, from any linux/unix terminal:

if you know how to mount it and find the usb stick in your filesystem, you can narrow down the search by changing the SEARCH_DIR="/path/to/your/mounted/usb"

bitdevs

Recover deleted private keys from a Ubuntu encrypted usb stick. Open to bounty.

anon

plug it in and try the bash script in this, from any linux/unix terminal:

https://chatgpt.com/share/66e794b2-7878-8010-a31a-304b9f6319aa

if you know how to mount it and find the usb stick in your filesystem, you can narrow down the search by changing the SEARCH_DIR="/path/to/your/mounted/usb"

I'll keep thinking on this.