Regular expression in java for deleting dot sign (.) and the char before it

user_13614472 0
Viewed 65

I have to create a program in java that reads a string from the user which contains dot (.) sign on it. I need to delete the dot and the char before it, and print the result.

So if the input is : mx.erw.ho.abe.a

It should print : merhaba

Or if the input is : lok.okl. u.ay.t t.tho.p.e e.sku.y

It should print : look at the sky

This is what i have done so far, which kind of works but it cuts out even the last letter of the word (if it is merhaba, this code prints merhab and if it is look at the sky, it prints look at the sk

How can i fix this?

public class HiddenMessage {
    
    public static void main (String [] args) {
        
        String [] message="lok.okl. u.ay.t t.tho.p.e e.sku.y".split("[.]");
        
            for(int i=0;i<message.length;i++) {
                
                    System.out.print(message[i].substring(0, message[i].length()-1));
            }
        
    
    }
}

Update:

So now my code looks like this if i want to take the input from the user. It prints merhaba just fine but it only prints "look" not "look from the sky"

import java.util.Scanner;


public class HiddenMessage {
    
    public static void main (String [] args) {
        
        Scanner input=new Scanner (System.in);
        
        System.out.println("Please enter the message: ");
        
        String message=input.next();
        
        String m1=message.replaceAll("\\w\\*", "");
        
        System.out.print(m1);
            
        
    }
}
regex java
1 Answers

You can use replaceAll() method and the regex \\w\\.

Try this:

String result = "lok.okl. u.ay.t t.tho.p.e e.sku.y".replaceAll("\\w\\.", "");
  • \\w : matches a word character (Letter, digit, underscore)
  • \\. : matches dot character

If you use the regex ".\\." it literally matches the dot and the char before it.

  • . : matches any character
Scanner input = new Scanner(System.in);

System.out.println("Please enter the message: ");

String message = input.nextLine();

String m1 = message.replaceAll("\\w\\.", "");

System.out.print(m1);
user_103674710
Related