Rewrite Rule for Domain Aliases on Apache - php

Question

I have a situation where in I have my main domain name as :
www.example1.com and I have an alias domain www.getexample1.com
Now, if someone hits www.getexample1.com, I wish to redirect to www.example1.com/newpage ; but www.example1.com should not undergo that redirection.
I tried using virtual host for this but it went into a redirect loop. Is there a RewriteCond and RewriteRule that can help solve the above issue?
Attempted Virtual Host Code:
<VirtualHost *:80>
# This first-listed virtual host is also the default for *:80
ServerName www.example1.com
ServerAlias getexample1.com
Redirect / https://www.example1.com/newpage
DocumentRoot "var/www/html"
<Directory "/var/www/html">
AllowOverride All
Require all granted
</Directory>
</VirtualHost>
I wish to only redirect getexample1.com to the redirect address, and not my name server domain. How can that be achieved?

Answer 1

Definately.
This should do the trick:
RewriteCond %{HTTP_HOST} ^www\.getexample1\.com$ [NC]
RewriteRule ^/?(index.(php|html))?$ http://www.example1.com/newpage [R=302,L]
Now, ^www\.getexample1\.com$ could also be ^(www\.)?getexample1\.com$ for matching both, www and no-www domain.
^/?(index.(php|html))?$ will match /, index.php and index.html, you can play around with this regex to, according to your requirements.
I used a 302 redirection for testing purposes, you can set it as a 301 redirection when you're sure that you have coded the rules you want (to prevent webbroser redirection caching issues).