Find name with given regexp, and show in dired.
Then we can open file, edit file even use wdired do awesome operation!!!
Then put grep-dired.el to your load-path.
The load-path is usually ~/elisp/.
It's set in your ~/.emacs like this:
(require 'grep-dired)
Use command grep-dired-dwim
search filename under current directory.
Use command grep-dired
for customize search.