JavaScript String replaceAll()

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

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

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.

The replaceAll() method does not work in Internet Explorer.

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:

string.replaceAll( searchValue, newValue)

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.

Type	Description
A string	A new string where the search values has been replaced.

A global, case-insensitive replacement:

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

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();
});