Question

How to validate a 10-digit phone number with hyphens (e.g. 333-555-1234) using RegEx in C#

Answer 1

using System;
using System.Text.RegularExpressions;

class Program
{
    static void Main()
    {
        string pattern = @"^\d{3}-\d{3}-\d{4}$";
        string phone_number = "333-555-1234";

        if (Regex.IsMatch(phone_number, pattern)) {
            Console.WriteLine("The phone number is valid");
        }
        else {
            Console.WriteLine("The phone number is invalid");
        }
    }
}



/*
run:

The phone number is valid

*/

 

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