using grep in dired mode: best method for ascii files

[Patrick Drechsler]

Hi,

can somebody give my a pointer in the manual on searching a
folder (including subfolders) for a regexp? The subfolder include
many binary files. I don't want to search the later.

I've tried `grep-find', 'A' and `find-grep-dired`. Also marking
the folders of interest in dired-mode. Often enough I end up
with a grep error `123'.

What I'm looking for is a command to find a regexp within my
files containing (ascii-)code.

Thankful for pointers,

Patrick
-- 
Snoopy (on being house-trained with a rolled-up newspaper): 
It does tend however to give one a rather distorted view of the press!