Hello,
I talk about egrep because it's simply a shortcut for grep -E but sure if you prefer, I edited all grep to egrep so this is a tutorial for egrep.
As for the regexp you can find it at the end of the tutorial.
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I did not really understand your challenge though I understood it as "do a french number checker or an ip address checker or a belgian number checker"
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
Thanks a lot :)