how to split at any of these characters in java code example

Example 1: java how to split a string into letters

//Java program to show the use of Split method (Java 8 and above)
public class SplitString{

  public static void main(String[] args) 
  {
    //Initialize the String which needs to be split
    String str = "Enlighter";
    
    //Use the Split method and store the array of Strings returned in a String array.
    String[] arr = str.split("");
    
    //Printing the characters using for-each loop
    for(String character : arr)
      System.out.print(char);

Example 2: split string 2 characters java

String str= "abcdef";

        String[] array=str.split("(?<=\\G.{2})");

        System.out.println(java.util.Arrays.toString(array));