Lab3EmailBreak.java

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 package assignment;

  import java.util.Scanner;
 //Program to break inputed email into username and domain name
 public class emailBreak {
 	public static void main(String[] args) {
 		Scanner userInput=new Scanner(System.in);
 		String testString,emailAddress;
 		boolean check;
 		do {
 			System.out.println("Please enter your email e.g: example@mail.com");
 			emailAddress=userInput.nextLine();
 			//String email_regex="[A-Z]+[a-zA-Z_]+@\b([a-zA-Z]+.) {2}\b?.[a-zA-Z]+";
 			String email_regex="^[_A-Za-z0-9-\\+]+(\\.[_A-Za-z0-9-]+)*@"+"[A-Za-z0-9-]+(\\.[A-Za-z0-9]+)*(\\.[A-Za-z]{2,})$";
 			testString=emailAddress;
 			check=testString.matches(email_regex);
 			if(!check) {
 				System.out.println("The email : \""+emailAddress+ "\" is Invalid\n");
 				//return;
 			}

  		}while(!check);

  			String[] parts= emailAddress.split("@");
 			System.out.println("\nFor the email address: "+emailAddress);
 			System.out.println("The user name is   : "+parts[0]+"\nThe domain name is : "+parts[1]);
 	}
 }