how to add space in mod rewrite

welcome every body
i need to add space between word and another in the link
ex.
i have link call

http://site.com/t-تلبيس الجاسوسات.html

i need it appear like

http://site.com/t-تلبيس_الجاسوسات.html in the browser

-replace (20%) with(_) in url

this is my mod rewrite which i use

RewriteRule ^t-([^.]+)\.html$ search.php?t=$1 [QSA,L,NC]

Code (markup):

 

URL encoding display is outside of your controll. It's controlled by the browser.

To work with whitespace in mod_rewrite you either escape the space "\ " or use the whitespace meta-character, "\s". Play with it if you want.