"Subdomain" with space in htaccess. as?

Question

Apache HTTP Server

Here are the lines
RewriteCond %{HTTP_HOST} ^(.+)\.tourist\.kharkov\.ua
RewriteCond %{REQUEST_URI} !=/viewpage.php
RewriteRule (.*) /viewpage.php?username=%1&$1 [L ,QSA]
allow you to enter
news.tourist.kharkov.ua or even
http://misha.tourist.kharkov.ua/
and see the page generated by the script http://tourist.kharkov.ua/viewpage.php?username=Misha
trouble comes if you enter something with spaces.
http://sergey%20palko.tourist.kharkov.ua/
How to solve the problem?

Answer 1

You may not need to deal with the space problem, because subdomain names with spaces are not written.

Answer 2

Alas, this is just the right time. Well, at least I really want to.