using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"(\d{3})-(\d{3}-\d{4})";
string input = "111-222-1111 222-111-1111 333-222-3333 444-888-9999";
MatchCollection matches = Regex.Matches(input, pattern);
foreach (Match match in matches)
{
Console.WriteLine("Area Code: {0}", match.Groups[1].Value);
Console.WriteLine("Telephone number: {0}", match.Groups[2].Value);
Console.WriteLine();
}
}
}