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copied!<p><code>RewriteRule</code> does not work with query string directly -- you have to use <code>RewriteCond</code> for that.</p> <p>Here is the rule -- it will redirect (301 Permanent Redirect) ANY URL that has more than 1 parameter in query string and 1 of them is <code>ref</code></p> <pre><code>RewriteEngine On RewriteCond %{QUERY_STRING} (^|&)ref=([^&]*)(&|$) RewriteCond %{QUERY_STRING} !^ref=([^&]*)$ RewriteRule .* http://%{HTTP_HOST}%{REQUEST_URI}?ref=%2 [R=301,L] </code></pre> <p>For example:</p> <ol> <li><p>It will redirect <code>http://www.example.com/hello.php?id=86&name=John&ref=12d34888&me=yes</code> to the same URL but with <code>ref</code> parameter only: <code>http://www.example.com/hello.php?ref=12d34888</code>.</p></li> <li><p>It will do nothing if only <code>ref</code> parameter is present or no parameter at all, e.g. <code>http://www.example.com/hello.php?ref=12d34888</code> or <code>http://www.example.com/hello.php</code>.</p></li> </ol> <hr> <p>If such redirect should only work for website root hits, then change the <code>RewriteRule</code> line to this:</p> <pre><code>RewriteRule ^$ http://%{HTTP_HOST}/?ref=%2 [R=301,L] </code></pre> <p>(this is if placed in .htaccess file in website root folder -- if placed in server config / virtual host context the rule needs to be slightly tweaked).</p> <p><code>http://www.example.com/?id=86&name=John&ref=12d34888&me=yes</code> -> <code>http://www.example.com/?ref=12d34888</code></p> <hr> <p>If it has to be redirected to another domain, then replace <code>%{HTTP_HOST}</code> by domain specific name, e.g:</p> <pre><code>RewriteRule ^$ http://www.exampe.com/?ref=%2 [R=301,L] </code></pre> <p><strong>It all has been tested before posting.</strong></p>

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