Question

How to validate a 10-digit standard 10 digit phone number using RegEx in C#

Answer 1

using System;
using System.Text.RegularExpressions;

class Program
{
    static void Main()
    {
        string[] phoneNumbers = {
            "333-555-1234",
            "(333)-555-1234",
            "333 555 1234",
            "333.555.1234",
            "+91 (333) 555-1234"
        };

        string pattern = @"^(\+\d{1,2}\s)?\(?\d{3}\)?[\s.-]?\d{3}[\s.-]?\d{4}$";

        foreach (var phoneNumber in phoneNumbers) {
            if (Regex.IsMatch(phoneNumber, pattern)) {
                Console.WriteLine("Valid phone number format");
            }
            else {
                Console.WriteLine("Invalid phone number format");
            }
        }
    }
}



/*
run:

Valid phone number format
Valid phone number format
Valid phone number format
Valid phone number format
Valid phone number format

*/

 

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