Write a regular expression that selects lines containing a phone number. Assume

Question

Write a regular expression that selects lines containing a phone number. Assume a U.S./Canadian number with a 3-digit area code, a 3-digit exchange and another 4 digits. An additional extension is also possible. Assume that the phone number will have dashes or periods in the "usual" way: 718-951-5000 or 718.951.5000. Dashes and periods cannot be mixed. Also, the area code may be surrounded by parentheses: (718)-951-5000. Extensions, if present, will start with an X or an x, preceded by a space or nothing and followed by at least one and no more than four digits. Oh, and one other thing: area codes do NOT start with 0 or 1, do they? What a mess! (But somebody has to do it-- and that's you!) For this exercise you must surround your solution with double quotes.

Explanation / Answer

The regular expression = "(\([2-9]\d{2}\)||[2-9]\d{2})(.\d{3}.\d{4}||-\d{3}-\d{4})(\s[xX]\d{1,4}||[xX]\d{1,4}){0,1}" Below is the code to test it. package com.cramster.nov5; import java.util.Scanner; public class RegularExpression { public static void main(String[] args) { Scanner input = new Scanner(System.in); System.out.printf("Enter Phone number : "); String number = input.nextLine(); String regularExpression = "(\([2-9]\d{2}\)||[2-9]\d{2})(.\d{3}.\d{4}||-\d{3}-\d{4})" + "(\s[xX]\d{1,4}||[xX]\d{1,4}){0,1}"; if(number.matches(regularExpression)) System.out.printf("Phone number is in correct format."); else System.out.printf("Wrong Phone Number"); } }

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