How do I make mod_rewrite suppress processing more rules?

Question

Given my current .htaccess file, how would I modify it to check for an additional URL path like '/src/pub/' and rewrite it to '/' without affecting the current rewrite?

Here's the original .htaccess file:

RewriteEngine on

RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d

RewriteRule ^(.*)$ index.php?route=$1 [L,QSA]

and here's my recent attempt (which doesn't work):

RewriteEngine on

RewriteRule ^/src/pub/(.*)$ /$1 [R]

RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d

RewriteRule ^(.*)$ index.php?route=$1 [L,QSA]

Edit: Here are some examples of what I want to accomplish:

New Additional Rule:

From:  http://www.mysite.com/src/pub/validfile.php
To:    http://www.mysite.com/validfile.php

From:  http://www.mysite.com/src/pub/user/detail/testuser
To:    http://www.mysite.com/user/detail/testuser

Existing Rule (already working):

From:  http://www.mysite.com/user/detail/testuser
To:    http://www.mysite.com/index.php?route=user/detail/testuser

Answer 1

I'm guessing that the problem is that the URL is being rewritten by the first rule, and then rewritten again by the second.

The solution to that is to add the "last" flag to the first rule, like this:

RewriteRule ^/src/pub/(.*)$ /$1 [R,L]