01. Extract Emails

package RegularExpressions;

import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class ExtractEmails {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        String input = scanner.nextLine();

        Pattern pattern = Pattern.compile("(^|(?<=\\s))([A-Za-z0-9]+)([\\._-]?)([A-Za-z0-9]*)@([A-Za-z]+)([-\\.]*)([A-Za-z]*)([-\\.]*)([A-Za-z]*)\\.([a-z]+)");
        Matcher matcher = pattern.matcher(input);

        while (matcher.find()) {
                System.out.println(matcher.group(0));
        }
    }
}