find-grep-dired
find-grep-dired is an interactive autoloaded compiled Lisp function in `find-dired.el
'.
(find-grep-dired DIR REGEXP)
Find files in DIR matching a regexp REGEXP and start Dired on output.
The command run (after changing into DIR) is
find . \( -type f -exec `grep-program' `find-grep-options' \
-e REGEXP {} \; \) -ls
where the car of the variable `find-ls-option' specifies what to
use in place of "-ls" as the final argument.