Hey Bakunin!

Thanks for the followup on your tuto! Again, I know it takes a lot of your time to write everything down so thank you very very much for that!

I tried out almost all of your explanations (except for the last multicommand part)!

The portion on sed greediness:
As far as I understand: The more I detail what I'm looking for to the command, the more I will be able to extract what I really want.
As you said: I tried with the \(aa\)* alone on your text and indeed I got more things that I really wished for:

Code:

sed -n '/\(aa\)*/p' sedgroupingtest.txt 
xy
xay
xaay
xaaay
xaaaay
xaaaaay
xaaaaaay

However, I'm not sure to understand why both xy and xay were matched as well? From what I understood, \(aa\) looks for at least 2 "a"s in each line doesn't it?
I also found a way to get what I was looking for ie. each line that has at least 2 "a"s:

Code:

ardzii@debian:~$ sed -n '/\(aa\).*/p' sedgroupingtest.txt 
xaay
xaaay
xaaaay
xaaaaay
xaaaaaay

The "selection" portion was particularly interesting:
If I read it correctly and with my sed knowledge now :P it goes:

Code:

the portion of text that is located in between the lines that start with "== Start + anything else to the end of the line ($)" and "== End + anything else to the end of the line ($)"

Now why my command doesn't work?
I've got a text file (that I personally called "examplesed.txt" which contains:
Now it seems that sed doesn't find for some reason the line I'm looking for:

Code:

> sed -n '/^<h1 itemprop='name'>For Sale.*$/p' examplesed.txt
>

so obviously when I try to do:

Code:

sed -n '/^<h1 itemprop='name'>For Sale.*$/ s/^.*itemprop='brand'>\([^<]*\).*/\1/p' examplesed.txt

The same happens: ie. NOTHING Hahahaha!

Why doesn't sed find this line correctly?
I though that maybe the command was considering the tabs that exist before the "<h1 itemprop='name'>For Sale" as a bunch of spaces and therefore I tried:

Code:

sed -n '/.*<h1 itemprop='name'>For Sale.*/p' examplesed.txt

But still nothing...

Thanks for your much appreciated help yall!

Best!

ardzii