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:
Quote:
Always keep in mind, btw.: i told you regexps are greedy in nature ("greedy" is really the term for it. The opposite is "non-greedy [matching]". More often then not if regexps do not do what you expect them to do this is the problem - they are matching more than you expect them to match.) This means i.e. that /\(aa\)*/ on its own would also match a line with 3 a's - it would match the 2 a's and just ignore the third one -> false positives, i warned you!
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:
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:
The "selection" portion was particularly interesting:
Quote:
/^== Start.*$/,/^== End.*$/
If I read it correctly and with my sed knowledge now :P it goes:
Now why my command doesn't work?
I've got a text file (that I personally called "examplesed.txt" which contains:
<div id="category_bg"> <div class="title"> <h1 itemprop='name'>For Sale <span itemprop='brand'>HITACHI </span> <span itemprop='name'>AIRIS 1 Magnet</span></h1></div> <meta itemprop="category" content="Business & Industrial>Medical Medical Equipment" /> <!-- end div title --> <div class="listing_num">LISTING #2229540</div> </div> <div style='border-bottom: dotted 1px #666' class="clr"></div> <div id="category_listing_body">
<div id="list_detail">
Now it seems that sed doesn't find for some reason the line I'm looking for:
so obviously when I try to do:
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:
But still nothing...
Thanks for your much appreciated help yall!
Best!
ardzii
Last edited by Ardzii; 01-31-2017 at 09:11 AM..
Reason: copy-paste error :)
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