simple mod rewrite

I'm htaccess stupid and I'm confident this is an easy one for anyone who knows their stuff.

I have several landing pages that are on specific domains. One of the ways I like to track is off the links I use. Users could end up at domain.tld or domain.tld/abcdefg and see the landing page based off the directory.

My question is, how can a user end up at domain.tld/abc or domain.tld/123 and see the same page without actually 301 redirecting to the home page?

I was going to just run an iframe throughout, but I'm n开发者_JS百科ot sure how to leave the destination URL alone so it doesn't change to the home page.

I believe what you're looking for is simply this:

RewriteEngine On
RewriteRule ^(123|abc)$ /