Case sensitivity

[PhilipNelson5]

I tried to find a prefix with capital letters. It was a simple 4 character prefix I though would be found quickly. I let it search for a few minutes with no success. I changed it to the same prefix but with lowercase letters and it found it quickly.

I assume it's failing because the generated hashes are use lowercase letters which never match the uppercase prefix.

Would it make sense to just convert the prefix to lowercase first?