[week1] Days 2 - Regex !

Regular expressions, often shortened to "regex" or "regexp", are patterns that help programmers match, search, and replace text. And in my dev journey I never feel like I need to learn regex, because it seemed so difficult to learn.But on my ride to complete the freeCodeCamp course i need to take this regex lessons on freeCodeCamp.

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Garabato Kid

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My daily code

I have done 13 of the 33 exercise, i have learned the basics of regex and find some ressources to test and getting more info on how to use it .

What did i learn ?

The basic format of a regex is like this :
/ expression / flags, i.e /[A-Z]+/g
You can group your expression by using parentheses (), or you can combine them by using logical OR |, it's possible to affect the search by using flags

In javascript you have multiple ways to use regex the first one is .test()

let testStr = "freeCodeCamp";
let testRegex = /Code/;
testRegex.test(testStr); // true

The second way is to find a matching string with
.match()

const paragraph = 'The quick brown fox jumps over the lazy dog. It barked.';
const regex = /[A-Z]/g;
const found = paragraph.match(regex); //Array ["T", "I"]

Common Regex symbol or flag

Symbol	Meaning
i flag	the search is case-insensitive
g flag	the search looks for all matches
*	Match 0 or more characters
+	Match 1 or more characters
[abc]	Any of a,b or c
[^abc]	not a,b or c
[a-z]	Any letter from a to z
[a-c2-8]	Any letter or number from a to z or from 2 to 8

Usefull Ressources

• regexr
• regex101 really similar to regexr
• MDN Docs
• Regular Expressions (RegEx) in 100 Seconds and there cheatsheet
• iHateRegex you can find a article on dev.to about it

Thank you for reading this post, hope you loved it 😀

PS:

• if you see any spelling or grammar mistakes, can you notify me (I am still improving my English) ? thank you !
• if you have any tips for improving my post feel free to comment on the post