Apache and Japanase website re-write module - apache

Question

I use to work on a multilingual website, within the next few months, we added Korean and we are now adding Japanese. Apart the fact that it generate a huge list of 404 errors on the logs files, I am having another issue with the urls. The Apache server response with a Bad request when I insert this url:
学校-詳細な評価-11
#[.htaccess]
RewriteRule ^学校-詳細な評価-(.+)$ /statistics.php?n=$1 [L]
I tried also using the [B] flag, but nothing changes.
I tried as well to remove character and I found that it only works if I do in this way:
#[.htaccess]
RewriteRule ^学-(.+)$ /statistics.php?n=$1 [L]
But of course I cannot avoid the issue in this way :D
I notice that Apache will convert the url to:
%E5%AD%A6%E6%A0%A1-%E8%A9%B3%E7%B4%B0%E3%81%AA%E8%A9%95%E4%BE%A1-11
Then I tried it as well:
#[.htaccess]
RewriteRule ^%E5%AD%A6%E6%A0%A1-%E8%A9%B3%E7%B4%B0%E3%81%AA%E8%A9%95%E4%BE%A1-(.+)$ /statistics.php?n=$1 [L]
But I'm still having the issue :(
Does anyone know how to fix it or why this is happening? I did a research but all forums and website only suggest to use the flag B at the end of the url.
Any help is welcome! Thank you :)

Answer 1

Try in Hex:
RewriteRule ^\xE5\xAD\xA6\xE6\xA0\xA1-\xE8\xA9\xB3\xE7\xB4\xB0\xE3\x81\xAA\xE8\xA9\x95\xE4\‌​xBE\xA1-(.+)$ /statistics.php?n=$1 [L]
For example with having this rule:
RewriteRule ^\xE5\xAD\xA6-(.+)$ /statistics.php [L]
this url http://domain.com/学-t will redirect to http://domain.com/statistics.php
For testing you can use online htaccess tester: http://htaccess.madewithlove.be/ and remember to change the page encoding to UTF-8 before testing.