Hi,
the first tip is the following. You are creating the new site under /new subfolder, but I guess you will move on the root once finished. If this is the case, you need to write your redirection rules properly, or they will stop to work. To avoid this, just go on the ReDJ plugin, under advanced options, add the current base path (/new/), so you can ignore it for now and then remove it after you will go live.
Now let's talk about your rules. Another suggestion is to create the rule with a 301 redirect, and change it to 200 (internal redirect) after you tested it works as expected.
REAL URL: www.colma.it/new/it/shoponline/bende-all-ossido-di-zinco/gelocast-plus-mt-10-x-10-cm-detail.html
SHORT URL: www.colma.it/gelocast-plus-mt-10-x-10-cm-detail.html
Try to create this rule (literally):
From URL: ^/gelocast-plus-mt-10-x-10-cm-detail\.html$
To URL: {scheme}://{siteurl}/it/shoponline/bende-all-ossido-di-zinco/gelocast-plus-mt-10-x-10-cm-detail.html
Request only: true (checked)
Let me know if this works.
Kind regards,
Luigi
