I feel like Luke's head is always cut off in his webcam view because his humongous chad brain wouldn't fit even if he went full screen.

@sch8836

4 жыл бұрын

It's a chest cam

@lovely-shrubbery8578

4 жыл бұрын

@@sch8836 that's hot

@yoyojuninho6130

4 жыл бұрын

He does that for the same reason he keeps wearing the sunglasses over his head.

@hershmysson

3 жыл бұрын

@@yoyojuninho6130 he feels naked without them

@Jooohn64

Жыл бұрын

Vegapunk ???

"Crucifixion, well that's a nice thing as well." - Luke Smith, 2020

@internetfriendsimulation9156

4 жыл бұрын

Luke confirmed for Longinus. Why else would he be so fluent in biblical languages?

@horndog2224

4 жыл бұрын

@@internetfriendsimulation9156 hes redpilled

2:06 grep stands for "global regular expression print". It is an ed command: g/re/p. Ed is the standard text editor.

@Jack-hd3ov

4 жыл бұрын

was about to say this, +1

@musicamonarchy3062

4 жыл бұрын

Ed is the standard text editor.

@francescominnocci

4 жыл бұрын

@@Jack-hd3ov same

@vN2w3Z59BM

4 жыл бұрын

kzread.info/dash/bejne/gIiasdCAirjAdM4.html that's just the backronym

@reralt

4 жыл бұрын

Brian Kernighan himself said came from g/re/p

"I want a period" - Luke Smith, 2020

16:30 You can also use [A-z] to match any upper or lower case character, because uppercase comes before lowercase in the ASCII table. That syntax actually means "match any character in the ASCII table between these two characters".

Finally, I needed a regex tutorial.

@sk8sbest

4 жыл бұрын

Sure u did

I use grep to cheat a text based game called 'hangman'. I use GNU grep "-w' option to word matching.. Example: $ grep -w 'v.ir.s' /path/to/dictionary/file Thank you.

@MarechalMaudutor

4 жыл бұрын

thanks for the information bro. الله يبارك فيك

@user-gz7rw8bs3v

3 жыл бұрын

...or for crosswords.

"\+" is nothing to do with the shell - it's because grep uses Basic Regular Expressions which doesn't include "+" as a metacharacter. If you use egrep (which uses Extended Regular Expressions) you won't need the "\".

@minhajsixbyte

4 жыл бұрын

@@juxuanu egrep is a thing. search it.

@minhajsixbyte

4 жыл бұрын

@@juxuanu No, sorry, misunderstanding, i thought you said "as far as i know its grep -E, not egrep"

@sk8sbest

4 жыл бұрын

@@minhajsixbyte egrep is deprecated

@minhajsixbyte

4 жыл бұрын

@@sk8sbest oh. i know very little about these things actually. but why is this depricated btw?

@minhajsixbyte

4 жыл бұрын

@@sk8sbest oh thanks I have searched and got the answer!

The problem for me with regular expressions is the learning curve with using them efficiently, and since I only need to use them infrequently, I never get familiar enough with their use, to use them to their best advantage. If I were using them all the time, I would not have to keep starting from scratch, learning how to use them.

Your channel has taught me more useful knowledge than college did

Great video! BTW “asdf./“ is actually a valid URL since all domain names technically end in a period after the TLD. Most software infers the period if it isn’t specified, which is usually the case. Specifying the period at the end is actually the more correct format. So for example “google.com./search” is valid and should work in any software that accepts a URL.

I swear I haven't really understood regex until now. Thanks for sharing your knowledge

7:32 listen carefully when he says "spool", he makes the perfect old Minecraft fall damage sound! Wizardry

Vim diesel

Luke could do a 10 video series on Regex and still not scratch the surface. I encourage this content !!!

To be honest this is one of the best videos on your channel Luke. Short and informative, thank you.

thank you so much, this is so useful and in depth. teach you basically 90% there I literally sit through the whole thing effortlessly. great video

I really like the way you explain Linux stuff!!

Words can’t describe how much I’m grateful for what you did

Luke shows us magic.

I was literally looking up several articles about regex today! This is perfect timing.

luke kept his knee in the face cam the entire time what a power move

15 years working as a developer, at last someone made regular expression easy! I finally understood! Thanks Luke!

Thank you Luke for this wonderful video.

I was recently thinking about starting to learn regex and this was really helpful as an introduction. Thank you.

Thank you for this Luke! This is a HUGE help for me 👍

Just in time, I needed this for writing my first script, thanks Luke!

The Word of Luke have Power...

super super, gracias por compartirnos este video. muy ilustrativo.

Thank you Luke!

Regular expressions is one of those things I need once in a while, wind up spending a bunch of time creating something that looks like I hit my head on the keyboard, then forget how I did it months later. It can be simple, but it can also start to get long and tiresome if the requirement is more complicated, like matching any valid IP address "(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)"

Thanks Luke, super helpful! Cheers

Thanks Luke. Good video!

Thank you ! It is a great lesson!!!

Спасибо! Хорошо всё объяснил. Хорошее видео

@Luke Smith keep up the good work 👍

Thanks for sharing

this was a useful video. ty luke. I have to admit the oomer convention made me laugh and was very meta

Very useful :) thank you!

Good introduction with good examples! To throw something useful into it, don't you find weird you need to escape '+' but not '*'? And '*' is a (famous) shell expansion, but '+' is not! Also, if this was the case, it would be solved by the usage of double quotes you do, which avoids expanding anything but the dollar sign (for variables), or by switching to single quotes, which don't allow for any shell processing. The actual thing happening is that grep uses default regular expressions and the plus sign is from extended regular expressions, which grep understands but only if they are escaped. To use extended regexps without the need for escaping their metacharacters, try egrep or grep -E.

@ganainm01

4 жыл бұрын

The "+" was not part of the original set of special characters; in fact, "a\+" (or "a+" with EREs) is just an alternative way to write "aa*".

Love regex so much..

Really helpful.

Yo I have no idea what I’m watching but it sounds cool.

I was going to Email you to ask you to do this video, Thank you Luke very cool.

thank you for video, i recently have been trying out DWM with dwmblocks, and wanting to write scripts for the statusbar, this was very helpful. im finding shell scripting very interesting and fun. i sure want to learn more. hope there's a follow up advanced video.

I wa implementing search functionality on my web app and regexp is essential thanks for this crash course

Suggestion for the future video: full-text instant search in a local 2 TB archive of textbooks and articles (PDF + DJVU). Using regex, of course.

@mfrederikson

4 жыл бұрын

insane

Just bricked my Grub while installing Debian to play around and spent a while getting it back. Let's keep that learning train Rollin!

Thank you very much for this. Please make advanced video on this too if you get time.

Regex is awesome.

No bloat on these pups. I like that.

I found this really usefull

9:20 Finally, I can call someone every single oomer at once

I consider myself decent at bash but your videos always provide value, thanks boomer

Me thinking yesterday: I should get around to learning regex for better grep/sed/awk etc Then you put this up. Cheers uncle Luke

Good video. Maybe make a part 2 where you go over grouping and such, as it is also quiet important :P

Luke Smith has saved Linux overnight, invented time travel, an alter ego and global warming.... and of course LARBS ;-)

wow that's a regex tutorial now.. can't wait more deeper examples

Will it help me find a soulmate?

@JurajOravecSGOrava

4 жыл бұрын

yes

@FishKungfu

4 жыл бұрын

@@JurajOravecSGOrava y y y y y y y y y y y ...

This actually is just in time for my sys admin class at uni over the summer, thanks luke!

This will actually land me a better job.. wow.

now that we've found all instances of a certain thing in a text file, can you make a video on deleting, moving, replacing, etc. -- putting to use the output we've gotten here? thanks a lot. chad-like teaching content as usual

I think newbies out there would also like to know that and \t also have special meanings: end of line and tab respectively. I'm not sure if that works with grep but it does work with other tools like python. I use them all the time

Nice work. I like your videos on general command line tools. Can I suggest a presentation on sed or awk? I know these tools may require longer videos but I m sure you can manage it

thnx

FINALLY

Luke, have you considered creating videos on cloud? You appear to be a systems thinker and I’d bet that you can teach cloud technologies pretty well.

boomer, zoomer, doomer, coomer. I can' t keep up anymore, I must be gbetting old. Apparently I am a boomer now according to the zoomers even though I never was a boomer before.

@morzinbo

3 жыл бұрын

boomer is a mindset as well as a generation of people that destroyed the USA

How are you quickly saving the 'note' file? I know ZZ is similar to :wq, but what's the similar command to :w? Where would I find the docs to read about commands like ZZ?

Congrats on reaching 90k subs Luke. Waiting for the 100k special video where you install FreeBSD on a Thinkpad X60.

Tnx for regx! Could you make a video on git and show us how you use it on your daily basis?

Great video. Thanks for sharing these fundamentals of regular expressions. Do these basics work on Vim? Thanks again.

If you decide to make a more advanced tutorial definitely include lookahead and lookbehind as I use them all the time.

n+1 th video about regex im watching

I clicked on this video because from the thumbnail I thought Luke was naked (his T-shirt colour).

5:04 yeah it's from the regural expressions of formal languages (more specifically Regural languages which are equivalent of L3 languages, those that can be generated form a right-linear grammar) where x* means {x}* so basically (x^0, x^1, x^2, ... ) x^0 is epsilon or lambda (also known as the empty word, a word of 0 letters) and x^1=x, x^2=xx, x^3=xxx and so on

@veryown8084

4 жыл бұрын

5:28 {x}^+ is basically the same as {x}^* but without the epsilon/lamda, so it's (x^1, x^2, x^3...) As you can see this have something to do with Math more specifically with monoids. More infos here: www.ncbi.nlm.nih.gov/pmc/articles/PMC3367686/ en.wikipedia.org/wiki/Regular_grammar

instead of [0-9] for all digits you can use \d, similarly for any non-digits you can use \D

Is there a reason you were using double quotes instead of single quotes? I would be more inclined to use single quotes with grep and egrep to avoid accidental expansion problems. Generally I only use doubles when I know that I really want expansion. Here is an example to demonstrate the difference. Add two lines to your rt file: The first is the sentence "Navigate to your $HOME directory." Then add the absolute address of your home directory to the file. You could do this with the command "echo $HOME >> rt" Now the results of grep "$HOME" rt and grep '$HOME' rt give very different results. Also, I tend to use either egrep or grep -E instead of just plain grep. This is in part because I cut my teeth on Regular Expressions in Perl, and egrep is closer to the Perl that I learned first. It is also considerably more powerful.

doing gods work! any cool projects like the corona project you had before?

Please keep making videso

Awesome. Next awk?

I never expected that GG Allin would lecture me about regex someday.

epic swag

"[a-Z]" should work the same as "[A-Za-z]". Although there might be a difference I'm unaware of.

@FyahBurn95

4 жыл бұрын

It matches by the actual code of the characters, and there are characters between z and A, so it would match all the letters plus other stuff.

@elandje

4 жыл бұрын

It will probably behave in an unexpected way, because the upper case letters come BEFORE the lower case letters in ASCII...

@FyahBurn95

4 жыл бұрын

@@elandje I was going to answer this, but if you try grep with [a-Z] it works, but if you do it with [A-z] it says "invalid range end". What??

@elandje

4 жыл бұрын

@@FyahBurn95 It is like I said, 'Z' comes before 'a' therefore it is invalid. [A-z] works, but includes a few non-letters, like [, |, ] and @. Search online for ASCII table.

@FyahBurn95

4 жыл бұрын

@@elandje Have you tried it? [A-z] does not work with grep for me, but [a-Z] does. I know what the ASCII table is and the fact that A-Z comes before a-z, and also that UTF-8 is an extension of ASCII, which is what matters unless you actually work with ASCII files.

My life: This is a learning exercise. Who cares.

You read my fucking mind

Luke before: Searches for Jesus Luke now: "Crucifixion, well that's a nice thing as well"

What I miss in this video: What to *actually* use regex for. Here's what I've used regex for: Refactoring code - I had some functions in JS that I wanted to turn into lambda's. Replacing HTML in several files - The files were partially identical and II wanted to replace something in the header elements. Find non-ascii letters - I copied Haskell code from a book and it didn't compile, because the book used unicode quotes for the comments and GHC broke on those quotes. Find the nth comma in a CSV file - I wanted to remove everything after the 3rd comma or something like that, because I didn't need that data - the file was too large to open in Excel. At the end of the day regex is a tool to serve a purpose. Don't learn it for the heck of it. Learn it because you can use it to solve problems.

@der0keks

3 жыл бұрын

wouldn't cut be better for the CSV thing? good tip for finding non-ascii though, that will come in handy.

@NostraDavid2

3 жыл бұрын

​@@der0keks Huh, didn't know the cut command was a thing! I'm more of a Windows guy, so I'm woefully behind on my terminal knowledge. Happy to hear someone has found something useful! The regex was [^\x00-\x7F] BTW, which is basically searching for any NOT ASCII char.

Hey Luke, sorry if this is too personal, but I noticed that you've started to display a lisp. Did you recently get Invisalign braces (or has the social isolation lowered your pronunciation level)? I had braces put on in my mid 20s and they made me a little lispy too

luke how did your setup handle multiple languages for your linguist work?

@cocoapuffs5299

4 жыл бұрын

i'm also interested in this, as i use arabic and spanish.

to match any letter, lower case or upper, i think you can do [a-Z]. much better.

I've yet to see a more digestible explanation of regex. And I have seen many.

Finally a regex to human translator

Tip for anyone like me out there: Watch all these videos at 0.75x. 😉

@FilthyPitDog

4 ай бұрын

haha

hey luke How can I integrate uganda.txt to my neovim i reaaally like it

Ed is the standard text editor

[A-za-z] can be reduced to just [A-z]

@saeedbaig4249

3 жыл бұрын

That gives me a "grep: Invalid range end" error. It worked though when I did [a-Z]

Luke could you make video about history of linux terminal editor ...

>I'm in

Or you can use \w to match letter and \W to match non letter And \d to match digit and \D to match non digit CMIIW