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Hi there again,

I'm still a newby in Python, so I'm taking the Google Python Class.

They talk about `ls -l`

and `rm -rf`

(with the last command the class started laughing)

But I don't understand it.

I googled it and a hint came to me, that is is a regular expression.

But I can't seem to find the true meaning of these RE's.

Can someone please explain what they do and maybe give me a website where I can find more of these expressions?

Thanks again!