Regular Expressions in Python || Python Tutorial || Learn Python Programming
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- เผยแพร่เมื่อ 7 มิ.ย. 2024
- 𝙎𝙩𝙖𝙮 𝙞𝙣 𝙩𝙝𝙚 𝙡𝙤𝙤𝙥 𝙄𝙉𝙁𝙄𝙉𝙄𝙏𝙀𝙇𝙔: snu.socratica.com/python
Regular Expressions (regex for short) is a way to search for patterns in strings. Python provides the re module to assist you in your efforts to search through strings. Maybe you want to find names in a database that satisfy certain conditions. But before you charge right in and start throwing regular expressions around, you need to learn the correct syntax.
In this video, you’ll learn how to compose regular expressions using such cryptic symbols as the caret (^), dollar sign ($), various backslashes (\d, \s, \w), and more. And just wait ‘til you see what happens when you start combining them into a powerful combo search expression.
We also introduce such concepts as quantifiers so you can see how many times you get a match. Match, that’s another handy function, along with fullmatch. You’ll learn how useful it can be to create groups to name certain parts of a regex. We could go on, but it makes more sense for you to watch the video and take notes. Then share it with a friend and have them take notes. Then you can compare your notes and see if you are in agreement.
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Python instructor: Ulka Simone Mohanty (@ulkam on Twitter)
Written & Produced by Michael Harrison
Edited by Megi Shuke and Michael Harrison
#Python #RegularExpressions #regex
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Great to see python videos again 😊
💯
I know right? 💜 I love the straightforward but humorous presentation.
I absolutely love Ulka's ability to deliver the dry sense of humor that permeates these videos. "To use regular expressions with python, import the 're' module. After hours of research, we were unable to find what 're' stands for."
something happens, and then they profit
uhuh uhuh uhuh...
Some people, when confronted with a problem, think “I know, I'll use regular expressions.” Now they have two problems.
Hi! I was a first year student when i used to watch your python tutorials.
Now i am a full-time Data Eng. and seeing your videos again makes me kinda nostalgic (in a positive way).
Thanks so much for your work, your videos helped me a lot during my first steps ❤
We love hearing about where your journey is taking you! Thanks for including us. 💜🦉
Thank you Socrotica for these beautiful video tutorials
𝙎𝙩𝙖𝙮 𝙞𝙣 𝙩𝙝𝙚 𝙡𝙤𝙤𝙥 𝙄𝙉𝙁𝙄𝙉𝙄𝙏𝙀𝙇𝙔: snu.socratica.com/python
Quick Note: In regular expressions, a dot . matches ANY character. So our URL regex, https?://w{3}.\w+ etc works, but could be greatly improved if we replace the . pattern with \.
The \. matches only the period.
Ulka has perfected her character. More of her teaching everything. She's awesome
Perfect timing, we're just starting with re in our Python class!
How is it going? I’m starting mine this week
I didn't expect it to be this easy to understand, thanks guys.
I thought I had some idea about regular expressions but now I know there's so much more to the re module.
Thanks for inspiring us to dive deeper into the re module.
Great to see another one of these videos. They're clear, concise and the format is really fun.
Great video. Note however that in the last examples with the URLs, you are using '.' to look for a literal dot in the URL. A single dot in a pattern matches any character. If you want to look for a literal dot, you need to use '\.'. Also, Python supports verbose regular expressions, that allow comments inside the code.
very good observation there
Love that Socratica is back! Y'all make the best educational videos I've seen in a long time, just binged the abstract algebra playlist and now hoping into more learning! Thank you!!
Forever my favorite channel
Glad these series is still alive and well :DD
Welcome back! Really happy to see your long videos again since you are the best teacher I've ever had
I love the dry wit of these Python tutorials 💜 I’ve been enjoying them for years and glad to see this new one! It’s so relevant. One can never have too many regexes. Well… maybe. But with this great presentation I am refreshing my skills and getting a chuckle at the same time. Cheers!
Seeing an upload of a Python tutorial with Ulka from Socratica once again after all this time made me incredibly happy.
Seriously, all of these are a bloody gem
I love Socratica so much. The writing, presentation and subject matter are awesome.
I'm happy to see a new Python video here!
❤Thank you for creating more Python videos! Theses are THE BEST! You ladies are awesome, thanks for making knowledge accessible.
By far the best channel i know for learning python. Thanks for everything!!! Unfortunately i wasted a lot of time watching confusing video´s from other python developers.
Great video, we need more of this!
This is the reason I am a Socratica patreon. Thank you - there will never be too many of these!
Amazing. Thank you for helping us make these videos possible! 💜🦉
These videos rock. Have been leveraging them to learn Python. Thank you.
Love Python videos from Socratica
RegEx is one of the most beautiful things that exists. Python make RegEx really easy and simple to use. 😍
Awesome tutorial, I love the way you teach.
I really liked this video! It taught me everything I needed to know quickly and it was incredibly funny. You've earned my sub!
It is great to see you back..
Such an amazing video... Very easily explained and effective for learning
Nice to see you again !
Love the python videos here at Socratica!
I'm glad to see this series back. I said only this week in a video that I was sad they were discontinued. I hope you do more.
Also would be good if you did some JavaScript in this style.
Thanks. Love these videos. Always a treat!
Great videos ever seen ,Your are making the videos as more understanding the concepts .This is best tutorials in youtube everseen .Thanks for the tutorial and do more .
Great video on regex and nice see new video after long time
Finally I found the best video in TH-cam
I am so happy to see my favourite AI tutor back ❤
Interesting! 👏
Her videos are like a Red Alert cinematic. I absolutely love them.
❤❤❤ More Python videos please!
I'm glad you correctly pronounced regex (not like rejex) , and used the correct plural of index (indices). It took me a bit, though, to realize you were ironical about being unable to find the meaning of re.
you're the best teacher
Yay! Python's back!
This series is great.
Yay...she's back! xx
I’ve missed her videos, she’s very entertaining.
Awesome resource, as usual. I'm debugging an API and traced the issue back to some bad regular expression in one of the controllers.
12:01 This regex will also match https followed by colon, followed by two forward slashes, followed by wwwsocraticaorg. The first dot would match the s, the backslash w+ would match ocratic and the last dot would match the a. To circumvent this, you need to escape the dot with a backslash.
I needed this ! thank you
Regular expressions go deep (really deep) - as in they are complicated and nuanced. This is an overview. The "corrections" explained in the comments are correct but maybe more useful for the next video on regex. I was going to suggest a video on regex module vs re... but that isn't a "learning" video, its an "advanced use case" video. Thanks Socratica!
A great content as always!
Add me to the people praising the "performance" (deadpan delivery and subtle humor) that makes these videos engaging and even entertaining. But I especially want to praise the basic design of splitting them into narrow topics and going into just the right depth.
I've learned over a dozen languages over the last 50+ years, so what I'm looking for as I learn Python is not the "This is a bit. This is a byte. This is a loop" basics I learned decades ago. What I need is is answers like "How are lists different from C arrays?" and "How is regex matching different from Awk or Perl?". Last week I needed to do some input validation, and regexes were the right tool. A few minutes with this video showed me the Python way to do it without needing to wade through a lot of non-regex material.
You're doing great. Thanks.
Love this channel
@Socratica which editor/theme do you use?
Good to understand 😊
love ur work Ulka you are a star. Please do a video to demystify the use of the super() function!!!
Welcome back. We missed you!
To save time and oxygen,... Classic!
Something happens,... and then they profit. Hilarious!
I love your videos. Straight to the point, not like humans who waste a lot of time.
Could you make some videos about GUI programming in Python?
Thank you I love your videos. I use them in my cyber security class to help my students with Python
We're so thrilled you're sharing our videos with your students. Thank you for letting us know!
Hey there great video and finally some python again! I have an annotation at 12:12 to make: while the dot technically matches the dot in regular expression it stands for "any character at all" (including the dot 🙂). If you really need a dot (and not a hyphen or anything else) we would need to escape that as well with \. 👏 Happy Holidays Socratica!
Excellent point! We should have spent some time talking about the . pattern since it's so common. We'll pin a comment to make sure people understand the difference between . \.
@@Socratica you never pinned this guys comment
omg ur sense of humour is awesome
after a long time!
Nice tutorial and nice video
great video and presentation, what is the software you used to make such great presentation?
One sequence i find handy is \h. It matches whitespaces, just like \s, but \s includes newline characters whereas \h doesn't. Usually when i search through text i want to keep to one line at a time.
edit: Actually disregard that. Apparently that sequence is not in python's regex module :(
For some reason, my brain always forgets which of ^ and $ is the correct one to use in each case. Now I will always remember the ^farmer$.
good explantion thankyou
You turn the lesson into fun activity I love you for that❤ very unique way of teaching do you have any Java course
thanks for saving some of my oxygen with this efficient learnings
Here’s a handy one: “\b” for matching word boundaries. For example, using “\bi\b” to search through code for the variable “i” without matching parts of every single word containing the letter “i”.
After months of research, I’m still unable to find what “re” stands for !! Love your videos !! Keep going
pls teach full python we love you
i think you meant letters when you are saying words!! you contents are awesome
I deeply applaud this video, thank you! But could you update this for python 3? A host of regex no longer functions as specified in this video.
I think regular expressions are like oysters: you either love them or hate them. Personally, I love them as they really helped me to extract data from one file format and convert it into another for usage in a land surveying statistical analysis program :)
Thank you
Thanks!
Thank you so much for your kind support!! 💜🦉
Q: ChatGPT, please extract two consecutive vowels by using regex in python from following string: "Francois".
A:....
Simple code problems do not need to be understood anymore, great!
Exactly my thoughts. The revolution's coming but not too many people in the comment section are aware of this😉
I don't think "do not need to be understood anymore" is the right approach to this time saving marvel, though.
@@cuszco Take it with a slight hint of sarcasm
@@oliver2671 That's actually a good idea. Thanks :D
Who knows. Perhaps "Hand-coded" will become a thing. Just like "Hand-Made". Then again... maybe not.
Enjoy examples They help Make it clear
doesnt the RE module stand for regular expretions?
WOW ...me at 5.32.... how cool is that???? cool video...
Well done as always, glad to see a new one. Richard K5ANR
re stands for regular expressions?
7:29 How did the regex match "HappyCodingRobot"? It starts with H not C.
Man I have spent quite a bit of time on regex, but as soon as I turn away from it for 5 seconds the knowledge floats away.
what does "?=.*" mean in regex? Expecting detail lesson.
Her expressions are so priceless
Thanks
Goodness, thank you so much for your support! 💜🦉
Regex is very powerful but I've always found it easy but confusing
"They start with carrots, something happens, and then they profit". That shit in 2x speed is hilarious
Correction @6:55 the regex is looking for strings that contain 'C' followed by word characters not string shat start with 'C' character. The regex needs the ^ prefix to make it search for sting starting with 'C'.
We were actually using this regex to look for any sequence of characters that starts with C, not strings that start with C themselves. Here's a case where some emphasis would have been a good idea, especially since so many of our examples used the ^ pattern.
Hi Socratica, Please be informed that the examples using char (code 710)" ^ " shown in this video do not match with the objetive ?? can you explain the reason? , for example the expression /^\w{7}$ / does not find any character.
Is Re module built in tho?
best
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Wait is this new series for Python?
RE stands for Regular Expressions 5:00
;0Thank you, I just wanted to know what REGEX was. Other videos were getting very complicated into the process of it, and all I wanted was to know what it was
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