You are searching for the IntelliJ IDEA Project Scopes feature [1]. It let you view group of files either manually set or automatically, based on what changed, what belongs to a particular problem, etc. Basically it exactly does what you are searching for :) 1 step further: it only can do this with regular expression; you can edit a regular expression in a new window and it automatically change it on the relevant place real time.

[1] http://www.jetbrains.com/idea/webhelp/scope.html