.htaccess redirect from one domain to another including subdomains

Question

I have two domains, for example:

• example.com
• website.co.uk

I want to redirect in the following ways:

• example.com --> https://www.website.co.uk
• alt.example.com --> https://www.alt.website.co.uk
• test.example.com --> https://www.test.website.co.uk

As you can see, I want it always to force https and www.

But, I also want it to remember the rest of the URL strcture, for example:

• example.com/folder/index.html --> https://www.website.com/folder/index.html
• alt.example.com/test/ --> https://www.alt.website.com/test/
• test.example.com/o/index.php --> https://www.test.website.com/o/index.php

I'm not sure the best way for this to be done, the two options I found were to try rewrite rules and the other was a 301 redirect.

Answer 1

Try the following rules

RewriteEngine on


#redirect subdomains
RewriteCond %{HTTP_HOST} ^((?!www).+)\.domain.com$
RewriteRule ^(.*)$ http://%1.domain2.com/$1 [L,R]

#redirect domain

RewriteCond %{HTTP_HOST} ^(www\.)?domain.com$
RewriteRule ^(.*)$ http://www.domain2.com/$1 [L,R]