"notify when replied to my post" for subscription

[q8-star]

Hi,

How many times did you wish when you post something you get a reply regarding your question or post only? instead of notifying you about every single post .

I don't know if this hack exists or not ,if not ,can any one do it ?

The Idea is for a hack that add a notification option while subscribing to a thread named "Notify me when someone reply to my post".

I think the application is simple and it can follow the following simple rule :
vb will send a notification to user (A) ,when ,User (B) write a post in thread that include a quote from user (A)'s post .

I hope I didn't make it very complicated ,but if done ,it can really be useful .