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copied!<h2>Rule 1:</h2> <pre><code>RewriteCond %{HTTP_HOST} !^www\.(domain1|domain2|domain3|domain4)\.com [NC] RewriteRule ^(.*)$ http://www.mydomain.com/$1 [L,R=301] </code></pre> <p>or:</p> <pre><code>RewriteCond %{HTTP_HOST} !^www\.domain1\.com [NC] RewriteCond %{HTTP_HOST} !^www\.domain2\.com [NC] RewriteCond %{HTTP_HOST} !^www\.domain3\.com [NC] RewriteCond %{HTTP_HOST} !^www\.domain4\.com [NC] RewriteRule ^(.*)$ http://www.mydomain.com/$1 [L,R=301] </code></pre> <hr> <h2>Rule 2</h2> <p><code>http://www.mydomain.com/username</code></p> <p>to</p> <p><code>http://www.mydomain.com/file4.php?name=username</code></p> <pre><code>RewriteRule ^username$ /file4.php?name=username [QSA,NC,L] </code></pre> <p>and if you want to make it generic (with alphanum chars):</p> <pre><code>RewriteRule ^([a-z0-9]+)$ /file4.php?name=$1 [QSA,NC,L] </code></pre> <hr> <h2>Rule 3</h2> <p>Get all together:</p> <pre><code>RewriteCond %{HTTP_HOST} !^www\.(domain1|domain2|domain3|domain4)\.com [NC] RewriteRule ^(.*)$ http://www.mydomain.com/$1 [L,R=301] RewriteRule ^([a-z0-9]+)$ /file4.php?name=$1 [QSA,NC,L] </code></pre> <p>Hope this helps.</p> <h2>Two hints:</h2> <p>Please try to use the <code>RewriteLog</code> directive: it helps you to track down such problems:</p> <pre><code># Trace: # (!) file gets big quickly, remove in prod environments: RewriteLog "/web/logs/mywebsite.rewrite.log" RewriteLogLevel 9 RewriteEngine On </code></pre> <hr> <p>My favorite tool to check for regexp:</p> <p><a href="http://www.quanetic.com/Regex" rel="nofollow">http://www.quanetic.com/Regex</a> (don't forget to choose ereg(POSIX) instead of preg(PCRE)!)</p>

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