Well, you didn't completely finish my task the way I intended, but still you proved to me that you actually understood the concept of it all. I just needed to make sure you didn't just copy / auto-translate this article from some eBook in English to French. Of course I knew about grep vs egrep myself, and by renaming the article headline (you can't re-edit the url of course) to egrep is also fine by me.

Approved!
@scipio