lucy24 - 10:00 am on May 13, 2011 (gmt 0)
No, no, it's just $1.
Parentheses mean "hang on to this text". $1 (and $2, $3 and so on if you're being fancy) mean "now spit it out again".
For example-- pulling something out of my own htaccess-- in
RedirectMatch 301 /paintings/blowups/(\w+)/(?:large)?(\w+)\.html$ /paintings/$1/$2.html
the first parenthesized bit goes into the $1 slot, and the second bit goes into the $2 slot, so
I do not actually have pages with these names.