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I want to have everything that looks like this:


to redirect to this:


unless the requested string is a specific file. So anything that doesn't have a . (dot), I want to redirect to index.php?u=[...]. I'll then parse the URI segments in PHP to determine what the user is requesting.

I've been looking around for how to do this, but have only a very rough understanding of regular expressions and have been unable to find an example of how to do it.

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2 Answers 2

Nevermind, figured it out. I found it's easier to match if something is in a string rather than if it isn't in a string, so this is what I came up with:

^.*\..*$ -> /$0

[stop matching if found]

^.*$ -> /index.php?u=$0

Not correct syntax of course, but you can easily adapt it to any number of rerouting systems.

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In Apache mod_rewrite you can check if the request is for a physical file with a condition such as:

RewriteCond %{REQUEST_FILENAME} -f

This is better than checking for a . (dot) in the filename - which could simply be present in the URL. To negate an expression simply prefix it with !. So, !-f matches if the file does not exist.

To internally rewrite everything else to index.php?u=XXX, where XXX is the original request then add:

RewriteCond %{QUERY_STRING} !^u=
RewriteRule ^ index.php?u=/$0 [L]

The RewriteCond directive is necessary to prevent a rewrite loop and basically checks that ?u= is not already present in the requested URL. Note that this is an "internal rewrite" - the URL in the address bar does not change. To externally redirect add the R flag on the RewriteRule, ie [R,L].

Bringing this all together in a .htaccess file in the document root:

RewriteEngine On
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{QUERY_STRING} !^u=
RewriteRule ^ index.php?u=/$0 [L]

If you only want to do this for specific URLs then modify the RewriteRule pattern (the first argument). So, for URLs that look like /1/2/3/4/5/[...]:

RewriteRule ^1/2/3/4/5 index.php?u=/$0 [L]

The slash prefix on the pattern should be omitted for per-directory .htaccess files.

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