Split String by Capital letters in Java

In this example, we will see how to write a program to split a string by capital letters in Java.

Java Program to split string by Capital Letters

To split a string by capital letters, we will use (?=\\p{Lu}) regex. We will pass this regex in Java String split() method as shown in the following program.

• \p{Lu} is a shorthand for \p{Uppercase Letter}. This regex matches uppercase letter.
• Similarly \p{Ll} is a shorthand for \p{Lowercase Letter}. This regex matches lowercase letter.

Source Code:

public class JavaExample{
  public static void main(String args[]){
    //a string with some capital letters
    String str = "IWantToSplitThisString";

    //split string by capital letters
    String[] strArray = str.split("(?=\\p{Lu})");

    //print substrings
    for(String s:strArray){
      System.out.println(s);
    }
  }
}

Output: