Change permalinks

Top @janiosarmento

Thank you, now it's perfect.

Here's the code I used adapted, following the pattern of your post:

location ~ "^/([0-9]{4})/([0-9]{2})/([^/]+)/(.*)$" {
	rewrite "^/([0-9]{4})/([0-9]{2})/([^/]+)/(.*)$" http://example.com/$4 permanent;
}