Can you please explain substitution in RewriteRule

Posted by Scott on Server Fault See other posts from Server Fault or by Scott
Published on 2013-08-13T15:55:50Z Indexed on 2013/11/09 21:57 UTC
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apache2

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mod-rewrite

I have the following statements in an .htaccess file

RewriteCond %{HTTP_HOST} ^myOldDomain\.com$ [NC]
RewriteRule  ^(.*)$ https://myNewDomaink.com/$1 [R=301,L]

It works fine. I basically found some sample code and modified it to my specific purpose. What I don't quite understand is:

Why does $1 refer to the the portion of the supplied url after the hostname - where is the documentation for this? There is no backreference in the RewriteCond.

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