How to read RegEx Captures in C#

Question

I started a C# book and I decided to throw RegEx\'s into the mix to make the boring console exercises a little more interesting. What I want to do is ask a user for their ph

Answer 1

string pattern = @"[(]?(\d{3})[)]?[ -.]?(\d{3})[ -.]?(\d{4})";

System.Console.WriteLine("What is your phone number?");
string phoneNumber = Console.ReadLine();

while (!Regex.IsMatch(phoneNumber, pattern))
{
    Console.WriteLine("Bad Input");
    phoneNumber = Console.ReadLine();
}

var match = Regex.Match(phoneNumber, pattern);
if (match.Groups.Count == 4)
{
    System.Console.WriteLine("Number matched : "+match.Groups[0].Value);
    System.Console.WriteLine(match.Groups[1].Value + "-" + match.Groups[2].Value + "-" + match.Groups[3].Value);
}