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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6. import java.util.Scanner;
  7.  
  8. class Ideone
  9. {
  10. 	public static void main (String[] args) throws java.lang.Exception
  11. 	{
  12. 		Scanner input=new Scanner(System.in);
  13.         String text;
  14.         String cha;
  15.  
  16.         System.out.println("Enter a Serial number: ");
  17.         text=input.nextLine();
  18.  
  19.         if(text.matches("[A-Za-z0-9]+(-[A-Za-z0-9]+){2}")){
  20.             System.out.println("Serial number "+text+" verification \nValid");
  21.             System.out.println("Enter a wildchar character: ");
  22.             cha=input.nextLine();
  23.             text= text.replaceAll("[A-Za-z0-9]", cha);
  24.             System.out.println("Masked serial: "+text);
  25.         } else if(text.matches(".*[^-A-Za-z0-9].*")) {
  26.             System.out.println("Invalid. Serial should only contain letters, numbers, and dashes(-)");
  27.         } else if(text.matches("[A-Za-z0-9]+(-+[A-Za-z0-9]+){2,}")) {
  28.             System.out.println("Invalid. There should be exactly 2 non-consecutive dashes in the middle. ");
  29.         }
  30. 	}
  31. }
Success #stdin #stdout 0.06s 2184192KB
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stdin
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1-2-3
*
stdout
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Enter a Serial number: 
Serial number 1-2-3 verification 
Valid
Enter a wildchar character: 
Masked serial: *-*-*
https://ideone.com/vgaJR7
language:
Java (HotSpot 12)
created:
5 years ago
visibility:
public

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