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When doing replacements, Javascript will replace as many b’s as it can find up until the next character that isn’t a b. You will find that the more time you spend on it the more it pays off.These strings all have and a followed by zero or more b’s. RegEx is quite readable once you get the hang of how things are being evaluated. Hopefully, you will with a little practice feel like RegEx is useful and can really make your code a whole lot shorter, more elegant and even readable. Additionally, I hope the real-world examples made you realize that you might just not need to install that extra node module. Hopefully, you now have a better grasp of what components it consists of. We really covered a lot of ground on the topic of RegEx. $, needs to end with, this means we ensure that someone doesn't input some crap after the domain name.(edu|gov|com), domain name, here we are listing allowed domains to be edu, gov or com.(\w+\.)*, here we are opening up for a number of subdomain or no one, given the *, e.g sthlm.region.\w+\., here we are matching a name that ends in.This opens for for a combination of 1) + 2) so per-albin.hansson or per.hansson or 2) alone which would per or hansson. (\w+), this one means exactly one word like an email consisting of just a last name or just a first name.
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Also, we end with * so 0 to many of that one.
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Regular Expressions or RegEx is about pattern matching. You will get instant feedback on resultsīrowser, pulling up Dev Tools in your browser and using the Console will work fine as well JavaScript REPL, this is a VS Code extension that evaluates what you type. This will start the REPL, it's a great way to test patterns Node.js REPL, If you have Node.js installed I recommend just typing node in the terminal. NET guide the Regular Expression info is quite general and applicable Some of the best explanations I've seen on RegEx groups.Įven though this is a. Good site, in-depth explanations with examples Sometimes they explain how RegEx is processed and can explain why the magic happens:Ī good site covering a lot of RegEx info. There are some great resources out there for RegEx that I consult regularly. If you have never worked with RegEx before or you struggle to see past all that weird magic - this is for you.
![regex javascript regex javascript](https://www.codeproject.com/KB/scripting/regex2/regex2.gif)
Also, I have some nice recipes at the end on how to do things like RegEx for email, passwords, date format conversions and how to process URLs. TLDR Is this long? Yes but it does go through the major constructs in RegEx. Let's learn how it works and how to actually use it and apply it to everyday problems that you recognize. RegEx is different from normal programming for sure but it is also something that's really really powerful. Sadly we are referring to it as black magic, the devil and other charming things. RegEx, Regular Expressions is a really powerful tool in our toolbox. In fact, a lot of my articles are to my future self that forgot everything about how to do something. # Regex in JS - how YOU can learn it and learn to like it