Regular expressions, also known as RegEx or RegExp, allow developers to define search patterns to match, search, and manipulate text. While they may seem complicated at first, mastering RegEx unlocks powerful text processing capabilities for your JavaScript code.
In this comprehensive guide, you’ll learn:
- What are regular expressions and why they’re useful
- RegEx syntax, operators, quantifiers, and flags
- Matching patterns, capturing groups, and lookarounds
- Common use cases for JavaScript RegEx
- Tools and libraries for creating RegEx
Let’s dive in!
What Are Regular Expressions?
Regular expressions are sequence of characters that define a search pattern. For example, the regular expression /w3schools/ consists of the letters w, 3, s, c, h, o, o, l, and s.
This RegEx pattern can then be used to search for matches in text — like finding the word “w3schools” in a string.
RegEx aren’t just for simple text matching. They allow you to check if complex patterns exist, extract portions of matching…
