How Do I Redirect All But Root Page To Another Domain?

I need to redirect all non-root page requests to a VirtualHost to another domain.

For example:

1) if www.domain1.com/page1 is requested, it needs to be redirected to www.domain2.com/page1
2) if www.domain1.com/ is requested, no redirect should occur, a page will be served

Simple enough.

www.domain1.com's DirectoryIndex is landing_page.php however, so another complication arises. I don't want the browser to have www.domain1.com/landing_page.php displayed in their browser, so I need an additional redirect from www.domain1.com/landing_page.php to www.domain1.com/.

So:
3) if www.domain1.com/landing_page.php is requested, a redirect should occur to www.domain1.com/

I simply don't understand what I'm doing with RewriteCond and RewriteRule, as you'll probably see in the following edited version of my VirtualHost in httpd.conf.

I've tried every variation of my current setup that I can think of, and the result's the same, it doesn't work properly.

Right now, according to the log, it appears that my problem is that when / is requested, internally apache is replacing / with landing_page.php, which I assume is failing the first condition as the headers are not external, then passes the second condition and forwards to www.domain2.com/landing_page.php.

Again, if www.domain1.com/ is requested, no redirects should occur, and the browser should display www.domain1.com in the address bar. If www.domain1.com/landing_page.php is requested, the browser should display www.domain1.com in the browser. If www.domain1.com/page_1.php is requested, a 301 redirect should switch them to www.domain2.com/page_1.php.

I'm sure I'm doing something very stupid. I'm frustrated and my head hurts :/
Any help is very appreciated. I can provide a log if necessary, will just need to change the names to protect the innocent.Start Free Trial

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<VirtualHost 1.2.3.4>
  DirectoryIndex landing_page.php
  ServerName www.domain1.com
 
  # redirect www.domain1.com/landing_page.php to www.domain1.com/
  RewriteCond %{THE_REQUEST} ^[A-Z]{3,9}\ /.*landing_page\.php\ HTTP/
  RewriteRule ^(.*)landing_page\.php$ $1 [R=301,L]
 
  # ensure that the request isn't the internal page request (landing_page.php)
  RewriteCond %{THE_REQUEST} ^[A-Z]{3,9}\ /.*\ HTTP/
  # if the request isn't for the home page..
  RewriteCond %{REQUEST_URI} !^/$
  # redirect to the equivalent domain2 page
  RewriteRule ^(.*) http://www.domain2\.com$1 [R=301,L]     
</VirtualHost>