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JavaScript String replaceAll() Method

JavaScript String replaceAll() Examples

text = text.replaceAll("Cats","Dogs");
text = text.replaceAll("cats","dogs");

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text = text.replaceAll(/Cats/g,"Dogs");
text = text.replaceAll(/cats/g,"dogs");

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More example below.

Description

The replaceAll() method searches a string for a value or a regular expression.

The replaceAll() method returns a new string with all values replaced.

The replaceAll() method does not change the original string.

The replaceAll() method was introduced in JavaScript 2021.

Note

If the parameter is a regular expression, the global flag (g) must be set, otherwise a TypeError is thrown.

Read more about regular expressions in our:

Syntax

string.replaceAll(searchValue, newValue)

Parameters Parameter Description searchValue Required.
The value, or regular expression, to search for. newValue Required.
The new value (to replace with).
This parameter can be a JavaScript function. Return Value Type Description A string A new string where the search values has been replaced. More Examples

A global, case-insensitive replacement:

let text = "Mr Blue has a blue house and a blue car";
let result = text.replaceAll(/blue/gi, "red");

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A function to return the replacement text:

let text = "Mr Blue has a blue house and a blue car";
let result = text.replaceAll(/blue|house|car/gi, function (x) {
  return x.toUpperCase();
});

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