Java - String replaceAll() Method

The Java string replaceAll() method returns the string with all occurrences of the specified regular expression replaced with specified string in the given string.

Syntax

public String replaceAll(String regex, String replacement)

Parameters

Return Value

Returns the replaced version of the specified string.

Exception

Throws PatternSyntaxException, if the regular expression's syntax is invalid.

Example:

In the example below, replaceAll() method returns the string where all occurrences of the specified regular expression are replaced with specified string in the given string called MyString.

import java.lang.*;

public class MyClass {
  public static void main(String[] args) {
    String MyString = "Hello World!";
    
    //l is replaced with k
    String NewString1 = MyString.replaceAll("l", "k");
    //printing new string
    System.out.println(NewString1);

    //ll is replaced with kk
    String NewString2 = MyString.replaceAll("ll", "kk");
    //printing new string
    System.out.println(NewString2);
  }
}

The output of the above code will be:

Hekko Workd!
Hekko World!