TypeScript String replace() Method

The replace() method in TypeScript is used to find matches between a regular expression or a substring and a string, replacing the matched substring with a new substring or the value returned by a function.

Syntax

string.replace(regexp/substr, newSubStr/function[, flags]);

Parameter: This method accepts five parameters as mentioned above and described below: 

• regexp: This parameter is a RegExp object.
• substr: This parameter is a String that is to be replaced.
• newSubStr: This parameter is a String that replaces the substring.
• function: This parameter is a function to be invoked to create the new substring.
• flags: This parameter is a String containing any combination of the RegExp flags.

Return Value: This method returns a new changed string. 

Below example illustrate the  String replace() method in TypeScriptJS:

Example 1: Basic Usage

This example demonstrates how to replace a simple substring with another string.

const str: string = "Geeksforgeeks is a great platform.";
const newStr: string = str.replace("great", "best");
console.log(newStr);

Output: 

Geeksforgeeks is a best platform.

Example 2: Using a Regular Expression

This example shows how to replace all occurrences of a substring using a regular expression.

const str: string = "TypeScript Geeksforgeeks Geeksforgeeks";
const newStr: string = str.replace(/Geeksforgeeks/g, "JavaScript");
console.log(newStr);

Output: 

TypeScript JavaScript JavaScript