Redirect Question

I help co-run a fairly large WP site. It was originally installed in the root directory, but we have to move its own folder now. The problem is there are a lot of links such as domain.org/12345, domain.org/23456, etc. that need to now point to domain.org/wp/12345, etc.

I’m not real familiar with .htaccess and the redirect codes that can be used there, but I assume there has to be a way to handle redirects much like DOS handled multiple files/folders utilizing the asterisk (*.exe).

Another way of looking at it is that I need domain.org/[folder] to redirect to domain.org/wp/[folder]

How can I tell the site that if someone enters a URL that consists of /1* (or /2*, /3*, etc.) that it should look for the folder at domain.org/wp/?