Changing domain names & preserving rankings

By implementing a .htaccess 301 redirect


# http://old-domain.com/any-path-xyz => http://new-domain.com/any-path-xyz
RewriteEngine On
RewriteRule ^(.*)$ http://new-domain.com/$1 [R=301,L]


# http://old-domain.com/old-dir/any-path-xyz => http://new-domain.com/any-path-xyz
RewriteEngine On
RewriteRule ^old-dir/(.*)$ http://new-domain.com/$1 [R=301,L]


# http://old-domain.com/old-dir/any-path-xyz => http://new-domain.com/new-dir/any-path-xyz
RewriteEngine On
RewriteRule ^old-dir/(.*)$ http://new-domain.com/new-dir/$1 [R=301,L]