SVN: moving files from inside the folder
svn move does not support wild cards. In the SVN redbook they state that this command can "Move and schedule a file or directory":
http://svnbook.red-bean.com/en/1.5/svn.ref.svn.c.move.html
You therefore have to call svn move for each file in the directory.
I suggest you to write a short script that does this for you or try to use one of the Subversion GUI tools.
I don't think you can use wildcards with repository URLs.
You need to check out https://example.com/repos/123/
. Then run svn move foo\123\* foo\
and commit.