Replace all Digits in a String with a Specific Character in Java

// Java program to replace all digits with an asterisk
public class Geeks {
  
    public static void main(String[] args) 
    {
        // Declare and initialize the string
        String s = "Hello123 World456";

        // Replace all digits with an asterisk (*)
        String s1 = s.replaceAll("[0-9]", "*");

        System.out.println("Original String: " + s);
        System.out.println("String after replacing digits: " + s1);
    }
}

// Java program to replace only specific digit 5 with '@'
public class Geeks {
  
    public static void main(String[] args) 
    {
        // Declare and initialize the string
        String s = "My phone number is 555-1234";

        // Replace only digit '5' with '@'
        String s1 = s.replaceAll("5", "@");

        System.out.println("Original String: " + s);
        System.out.println("String after replacing digit 5: " + s1);
    }
}

// Java program to replace numbers greater than 100 with '@'
public class Geeks {
  
    public static void main(String[] args) {
      
        // Declare and initialize the string
        String s = "The numbers are 25, 100, and 200.";

        // Replace all numbers greater than 100 with '@'
        String s1 = s.replaceAll("\\b[1-9][0-9]{2,}\\b", "@");

        System.out.println("Original String: " + s);
        System.out.println("String after replacing large numbers: " + s1);
    }
}