url rewriting - Rewrite only URLs that don't exist -

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i'm looking way rewrite urls if path doesn't exist. isn't handle 404s, redirect page urls shared php file (ie: '/contact-us/' -> '/show_page.php?page=contact-us').

the basic redirect easy enough achieve, want able override default page adding /contact-us/index.php in site root.

is achievable mod_rewrite or have else?

just check value of request_filename variable:

rewritecond %{request_filename} !-f rewritecond %{request_filename} !-d rewriterule ...

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