Regular Expressions

Regular expressions (regex) are powerful tools for pattern matching and text manipulation, enabling developers to search, replace, and validate data efficiently. Whether you're parsing logs, validating user input, or quickly finding patterns in large datasets, understanding regex can significantly streamline your coding tasks.

For example, you can use regex to do email validation. Here is a simple regex that matches most email addresses:
Here is how we can use it in JavaScript:

const emailRegex = /^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$/;
const email = '';
const isValidEmail = emailRegex.test(email);
console.log(isValidEmail); // true or false

Regex testerRegex cheatsheet