How to use Regular Expression to replace characters from String In Javascript

Using String replace() Method to replace characters from String

Using split and join Method to Replace Characters from a String

To replace all occurrences of a string in JavaScript using a regular expression, we can use the regular expression with the global (g) Flag.

Example: In this example we will replace “Welcome” with “Hello” in the given string “Welcome w3wiki, Welcome geeks”.

Javascript

const str = 'Welcome w3wiki, Welcome geeks';
const searchString ="Welcome";
const replacementString ="Hello";

let regex = new RegExp(searchString, 'g');

let replacedString = 
    str.replace(regex, replacementString);

console.log(replacedString);

Output

Hello w3wiki, Hello geeks

JavaScript Program to Replace Characters of a String

Given a String the task is to replace characters of String with a given String in JavaScript.

Examples:

Input: Str = Welcome to GfG
       strRepl = GfG
       newStr = Geeks
Output: Welcome to Geeks

Table of Content

Using map() & split() method to replace characters from String
Using String replace() Method to replace characters from String
Using Regular Expression to replace characters from String
Using split and join Method to Replace Characters from a String

Tags:

#JavaScript-DSA #JavaScript #Web Technologies

Using String replace() Method to replace characters from String

Using split and join Method to Replace Characters from a String

How to use Regular Expression to replace characters from String In Javascript

JavaScript Program to Replace Characters of a String

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