Mod rewrite with parameters

Question

In fact, I am working on a small PHP script and I want to redirect this :

http://localhost/app-[NUMBERS].html?code=[LETTERS AND NUMBERS]

to this:

http://localhost/app.php?id=[NUMBERS]&code=[LETTERS AND NUMBERS]

Answer 1

RewriteRule ^app-([0-9]+)\.html /app.php?id=$1 [L,QSA]

This captures the numeric portion of the request, and converts it to the id query string parameter. The QSA flag deals with any existing parameters, and passes them through untouched.

eg

http://scratch.bagheera/app-12345.html?code=ABC123

->

http://localhost/app.php?id=12345&code=ABC123