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Intro to Regular Expressions - How to use Regex in C#

IAmTimCorey

47,989 views

Regular Expressions are incredible, but they can also be incredibly terrifying. To make matters worse, you have probably heard that regular expressions are expensive and should be avoided. In this video, we are going to see how easy regular expressions can be, and we are going to see how they can be very quick as well.

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20 Comments

@vidyesh 1 year ago

/*
* ^ - Starts with
* $ - Ends with
* [] - Range
* () - Group
* . - Single character once
* + - Matches one or more occurrences of the preceding element.
* It requires at least one occurrence for a match.
* * - Matches zero or more occurrences of the preceding element.
* It can match zero occurrences, meaning the element is optional.
* ? - optional preceding character match
* ?= - Positive lookahead assertion. It is used to assert that a certain pattern can be
* matched ahead in the string without consuming any characters.
* This means it checks for the presence of a pattern but does not include it in the match.
* \ - escape character
* \n - New line
* \d - Digit
* \D - Non-digit
* \s - White space
* \S - non-white space
* \w - alphanumeric/underscore character (word chars)
* \W - non-word characters
* {x,y} - Repeat low (x) to high (y) (no "y" means at least x, no ",y" means exactly x)
* (x|y) - Alternative - x or y
* [^x] - Anything but x (where x is whatever character you want)
*/

@alanbull4219 4 months ago

Great video. You put a lot of effort into preparing good test data and the story of logical stages of complexity. And well done for reminding coders to add meaningful comments.

@Warlaga 3 years ago

What a real one. This helped immensely

@emon1019 2 years ago

As always, clear to understand and on point. My 55 minutes well spent. Thanks Tim

@egcoolmauricio 3 years ago

Oh man, you're amazing. I always learn something new from you. thank you a lot to spend time making these videos for the community. Regards from Argentina

@torrvic1156 1 year ago

Thanks for sharing your knowledge with us, Mr. Corey!

@ashcancharbagebin 3 years ago

watching this and i'm already applying regex to my own code. understandable explanations, jargon-free, this is why i love your videos!

@pp-studio 3 years ago

Thank you for great content. I learned a lot and very clear for Beginning RegEx

@ZacharyOsborne 3 years ago

I’ve recently had something come up where I was going to have to start using RegEx. Perfect timing! This was very helpful, thanks for all your hard work and always delivering great content!

@laythabdulkareem1887 3 years ago

You're super amazing!
I begin to love C# more and more!

@ElCidPhysics90 3 years ago

This was a great tutorial. Thank you, Tim

@kc1553 2 years ago

That was awesome. Perfect video to get started with Regex. Thank you!

@CrustPunkx 3 years ago

You nailed it Tim!!! I was always scared of these.

@karthiks4347 3 years ago

I am a programmer since 2000, never cared to learn Regular expressions till now. I watched this video completely today and started to get interested in RegEx! Thankyou Tim :)

@nicoleneff9393 3 years ago

Great explanation! Thank you very much!!

@ayam_jantan_ 2 years ago

this video is so helpful. thanks Tim

@RodrigueKamdieun 3 years ago

This is amazing Tim!
Thank you for this tutorial.

@Norman_Fleming 3 years ago (edited)

Another helpful video for people that have not used regex. I really love how you always point out to use the right tool for the job.
Code comments are there to explain WHY you are doing something even more than WHAT you are doing. Maintaining comments is part of the change.

I have personally only used regex in these basic types of data matching. I had a developer that used it to extract data elements and do code editing using across generated code to upgrade it instead of regenerating the object classes/methods.