First always do a BACKUP
Then using WP-CLI it’s possible to preview the changes of the website address with this command line adding at the end –dry-run
wp search-replace 'http://mysite.dev' 'http://mysite.dev2' --dry-run
Then if the result is ok it’s possible to launch the command without –dry-run
wp search-replace 'http://mysite.dev' 'http://mysite.dev2'