Please help me debug this Java program!

package debugme; /* * "THE CASE OF THE SPLITTING PHONE NUMBER" * * In this debugging assignment you will write a "regular expression" that will * accept a phone number in the correct format. Regular expressions help in * matching strings. Page down to line 37 and provide the regular expression * as a string that will accept a phone number in the format: (999) 999-9999 * * HINT: Refer to page 700, Section 16.7 * * VALID OUTPUT: (THIS IS WHAT YOU ARE GOING FOR!) * Please enter phone number: * (123) 678-0909 << NOTE THE FORMAT WITH PARANS AND SPACE * Area Code: 123 << AREA CODE SPLIT * Phone Number: 6780909 << PHONE NUMBER SPLIT - NO DASH * * INVALID OUTPUT: * Please enter phone number: * (123)5550909 << NOTE THE INPUT FORMAT IS INCORRECT * Invalid input. << ERROR MESSAGE */ import java.util.Scanner;

public class CaseOfTheSplittingPhoneNumber { public static void main( String args[] ) { Scanner scanner = new Scanner( System.in ); System.out.println( "Please enter phone number:" ); String phoneNumber = scanner.nextLine();

/////////////////////////////////////////////////////////////////////// // Provide, as a String, the regular expression that splitPhoneNumber // should be. /////////////////////////////////////////////////////////////////////// String splitPhoneNumber = ; // <<-- ADD YOUR REGULAR EXPRESSION HERE!! if ( !phoneNumber.matches( splitPhoneNumber ) ) { System.out.println( "Invalid input." ); System.exit( 1 ); }

String[] tokens = phoneNumber.split( "\\) " ); String areaCode = tokens[ 0 ].substring( 1 ); tokens = tokens[ 1 ].split( "-" ); String number = tokens[ 0 ] + tokens[ 1 ]; System.out.printf( "Area Code: %s Phone Number: %s ", areaCode, number ); } }