Youtube keyword filter

Hey,

Is it possible to block all youtube searches but, allow only those that contain keywords that are deemed acceptable?

For example block "how to make a bomb" but allow "how to make muffins"

I am thinking something like blocking the url: h t t p://w w w.y o u t u b e.c o m/results?

Then using REGEX for the exceptions like this: "^https?://(*\.)?youtube.com/results?search_query=[muffin|bunnies|rainbows]*

Make sense?

thanks
aaron.