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RewriteEngine On
# make sure we don't rewrite for malchias.com or www.malchias.com
RewriteCond %{HTTP_HOST} !^(www\.)?malchias\.com$ [NC]
# match <anyhost>.malchias.com (capture <anyhost> in %1)
RewriteCond %{HTTP_HOST} ^([^.]+)\.malchias\.com$ [NC]
# rewrite <anyurl> to /home/lddmarketing/<anyhost>.malchias.com/<anyurl>
RewriteRule ^(.*)$ /home/lddmarketing/%1.malchias.com/$1