htaccess rewrite question

[inwybx]

hi is it possible to rewrite some pages, while all the existing HTML pages are there, for example

if i have 100 static HTML pages in my website and now i need to add some PHP pages with mod rewrite as newtestpage.html

is it possible to crate such a rule in htaccess file so that i can only rewrite php files with .html extension while my physical HTML files works too

[Useful_idiot]

I guess it is possible. Even I've found the below URL while searching for the solution. Hopefully helpful.

mod_rewrite rewriterule generator :: Webmaster Toolkit