[olug] apache mod_rewrite question

[David Walker]

This is the answer I came up with.  It looks a little confusing where it says 
$12.html but that gets interpreted as ($1)(2.html) as far as I can tell.

RewriteEngine  on
RewriteBase /

RewriteRule    ^0/0/(.*)1.html$ /0/0/$12.html [L]



On Wednesday 27 February 2002 05:15 pm, you wrote:
> Of course, as soon as I post a question to the list, I figure it out. This
> solution seems a little kludgy, but it works.
>
> RewriteCond %{REQUEST_URI} ^/0/0/.*/1.htm$
> RewriteRule ^/0/0/(.*)/1.htm$       -       [E=STATUS:$1]
>
> RewriteCond %{REQUEST_URI} ^/0/0/.*/1.htm$
> RewriteRule ^/0/0/.*/1.htm$ /0/0/%{ENV:STATUS}/2.htm [L]
>
>
> The key here was finding a way to reference the "matched" directory in the
> RewriteCond line, since I could never be sure of the full path to the
> directory (assuming potential infinite subdirs). The answer here lies in
> the use of the "E=" directive and the $1 backreference. "E=" allows you to
> set an environment variable that can then be referenced by a cgi script or
> (in this case) in another RewriteRule line. The $1 is a backreference
> which gives you access to a part of your RewriteRule first argument that
> is contained in parenthesis. In this case, my first argument was
>
> ^/0/0/(.*)/1.htm$
>
> The parenthesis part is
>
> (.*)
>
> which means I can reference whatever that resolved to as $1. If I had a
> second parenthesis part, I could reference that as $2, etc, up to $9.
>
> So I set the made-up environment variable STATUS to the value of $1, and I
> can then use the %{ENV:STATUS} string to get the value of that environment
> variable and use it to construct my rewrite string, which I do in the 2nd
> RewriteRule line.
>
> If you ever do stuff with mod_rewrite, keep these pages handy:
> The Official Apache documentation on mod_rewrite:
> http://httpd.apache.org/docs/mod/mod_rewrite.html
>
> Ralf S. Engelschall's (the author of mod_rewrite) guide to mod_rewrite,
> with examples:
> http://www.engelschall.com/pw/apache/rewriteguide/

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