I could really use your help with this.  The examples I have received from 
everyone thus far have not worked, including the last one that you posted.  
This is the situation:

I have multiple domains, each with multiple subdomains, all of which 
automatically point to the root of my web environment.  I have only one file 
that does all of the work for all of these websites/webpages, and that is 
the index.php file in the root.  This file is smart enough to parse the url 
being accessed and create an appropriate page based on a very complex set of 

Originally, I was using the ErrorDocument 404 to make it access the 
index.php file, but this has some inherent flaws.  The biggest problem was 
that forms that were being posted to a page that doesn't really exist never 
maintained the posted variables (due to the 404 redirect.)  Another 
limitation was that it just created a bunch of unnecessary error messages in 
my error log since there are no "real pages" on my network, even though it 
pretends there is.

So, I need to use mod_rewrite.  That is apparent now.  The problem is I know 
nothing about creating regular expressions.  I simply need it to rewrite the 
url for any file that does not exist (it should not try to do so for a file 
that really does exist, say an image file) and it needs to have the 
following rule:


Where A is a subdomain; B is the domain name; C is the top level domain; D/E 
are a file or directory.

Some examples would be:


Can you tell me how to do this?  I would appreciate your help so much!!


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