Hi please i need a help ... i have something like this:

Options +FollowSymLinks
RewriteEngine On
RewriteCond %{QUERY_STRING} (\<|%3C).*script.*(\>|%3E) [NC,OR]
RewriteCond %{QUERY_STRING} GLOBALS(=.|\[|\%[0-9A-Z]{0,2}) [OR]
RewriteCond %{QUERY_STRING} _REQUEST(=|\[|\%[0-9A-Z]{0,2})
RewriteRule ^(.*)$ index.php [F,L]

I dont fully understand the code but i know that it blocks bad charakters for security reasons of course... but when i trying to get url with "." dot inside to example Trki.medzera it not works... how can i enable a dot... or ... am i looking even at good code? or it makes problem because something else. Thx a lot!