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Regular Expressions in JavaScript

Explore the fundamental concepts of writing regular expressions in JavaScript. Understand the two main syntax formats, how to create RegExp objects, and apply modifiers for case-insensitive, global, and multiline matching. This lesson helps you master practical uses of RegEx to enhance pattern matching skills in JavaScript.

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We know that literals and positional/frequency quantifiers are used to create more elaborate patterns. In this lesson, we will how to write RegEx in JavaScript.

Syntax in JavaScript

There are two formats when writing a RegEx in JavaScript.

Node.js
var regex1 = /[a-b]*/; // Create a regex and assign to regex1
var regex2 = RegExp('[a-b]*'); // Create a regex and assign to regex2
console.log(regex1,regex2); // Print the regex variables

In the first format (line 1), use the / operator to tell JavaScript to create a RegEx. ...