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🎉 Day 46 — React Mastery Completed (Final Summary & Congratulations!)

🎉 Day 46 — React Mastery Completed (Final Summary & Congratulations!) Congratulations, developer! 👏 You’ve successfully completed the 45-Day React.js Roadmap — from understanding the fundamentals to mastering advanced concepts like Redux, Routing, Testing, and Deployment. 📘 What You’ve Learned ✅ React basics — Components, JSX, Props, and State ✅ Hooks — useState, useEffect, useRef, useMemo, and Custom Hooks ✅ Context API and Redux Toolkit for global state management ✅ Routing with React Router & Protected Routes ✅ Data fetching using Fetch API, Axios, React Query ✅ Advanced Patterns — Compound Components, Render Props, HOCs ✅ Styling — CSS Modules, Styled Components, Theming ✅ Animations, Accessibility, Testing, and Performance Optimization ✅ Deployment on Vercel, Netlify, or GitHub Pages 🧩 Final Project Ideas Now that you’re done, build real-world apps to polish your skills: 📝 Task ...
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📘 Day 49: Regular Expressions (RegEx)

📘 Day 49: Regular Expressions (RegEx)

Regular Expressions (RegEx) are patterns used to match, search, and replace text in strings. They’re extremely useful for input validation and text analysis.

🔹 Basic Example

let pattern = /hello/;
let text = "hello world";
console.log(pattern.test(text)); // true

🔹 Character Patterns

  • [a-z] → lowercase letters
  • [0-9] → digits
  • \d → digit shortcut
  • \w → word character
  • + → one or more
  • * → zero or more

🔸 Example: Email Validation

let emailPattern = /^[a-zA-Z0-9._]+@[a-z]+\.[a-z]{2,3}$/;
console.log(emailPattern.test("rahul@gmail.com")); // true
console.log(emailPattern.test("rahul@123")); // false

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