Replace Duplicate Occurrence in a String in JavaScript

What is jQuery's Equivalent of str_replace in JavaScript?

Last Updated : 22 Nov, 2024

In JavaScript, the equivalent of PHP’s str_replace is the replace method of strings. While jQuery doesn't offer a direct str_replace equivalent, JavaScript’s replace and replaceAll methods can be used effectively.

1. Replace a Single Instance with replace

This method replaces the first occurrence of a substring.
replace("world", "JavaScript") replaces the first occurrence of "world" with "JavaScript."
Works for single, non-repeated replacements.

JavaScript

const original = "Hello, world!";
const result = original.replace("world", "JavaScript");
console.log(result);

Output

Hello, JavaScript!

2. Replace All Instances with replaceAll

For multiple replacements, use replaceAll (introduced in ES2021).
replaceAll("world", "universe") replaces all occurrences of "world."
This method is straightforward for global replacements without regular expressions.

JavaScript

const original = "Welcome to the world of JavaScript. Explore the world!";
const result = original.replaceAll("world", "universe");
console.log(result);

Output

Welcome to the universe of JavaScript. Explore the universe!

3. Using Regular Expressions for Global Replacement

For broader compatibility, use replace with a regular expression.
/world/g is a regular expression to match all occurrences of "world."
The g flag ensures all matches are replaced.

JavaScript

const original = "The world is vast. The world is beautiful.";
const result = original.replace(/world/g, "universe");
console.log(result);

Output

The universe is vast. The universe is beautiful.

Replace Duplicate Occurrence in a String in JavaScript

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