Index: JavaScript RegEx
Regular Expressions (Regex) are powerful search patterns used to find, match, and manipulate text.
Think of Regex as a smart filter — it can detect and extract information based on patterns, not just specific words.
For example:
- You can find all email addresses in a document.
- You can check if a phone number has the right format.
- You can replace all extra spaces, punctuation, or unwanted characters in a paragraph.
Regex works across almost every modern programming language — Python, JavaScript, Java, C#, PHP, and many others — because pattern matching is a universal need.
✨ Why Use Regex?
Regular expressions are used when you need precision and flexibility in text searching or text cleaning.
Let’s see where Regex becomes a superhero:
| Scenario | Task | Example |
|---|---|---|
| Validation | Check if an input looks like an email, phone number, or date. | user@example.com ✅ |
| Searching | Find all mentions of a word, even if it’s written differently. | “dog”, “Dog”, “DOG” 🐶 |
| Cleaning Data | Remove unwanted characters or extra spaces. | Hello!!! → Hello |
| Extraction | Pick out useful parts of text, like URLs or hashtags. | #learning, #python |
| Formatting | Rearrange text to a specific structure. | 2025-10-25 → 25/10/2025 |
In short, Regex gives you the power to talk directly to patterns within text — not just exact characters.
In this series of lessons, we’ll uncover how RegEx works in JavaScript, one piece at a time — from simple matches to capturing groups, look-aheads, and dynamic replacements.
By the end, you won’t just “use” regex — you’ll speak its language fluently. Ready to unlock the code behind the patterns? Let’s dive in! 🚀
Click below to navigate to each lesson:
- JS REGEX 01
- JS REGEX 02
- JS REGEX 03
- JS REGEX 04
- JS REGEX 05
- JS REGEX 06
- JS REGEX 07
- JS REGEX 08
- JS REGEX 09
- JS REGEX 10
- Adventures in Regex Land
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