Extract Emails

/* Write a program to extract all email addresses from given text.
 * The text comes at the first input line.
 * Print the emails in the output, each at a separate line.
 * Emails are considered to be in format <user>@<host>, where:
 * <user> is a sequence of letters and digits, where '.', '-' and '_' can appear between them.
 * Examples of valid users: "stephan", "mike03", "s.johnson", "st_steward", "softuni-bulgaria",
 * "12345". Examples of invalid users: ''--123", ".....", "nakov_-", "_steve", ".info".
 * <host> is a sequence of at least two words, separated by dots '.'.
 * Each word is sequence of letters and can have hyphens '-' between the letters.
 * Examples of hosts: "softuni.bg", "software-university.com", "intoprogramming.info",
 * "mail.softuni.org". Examples of invalid hosts: "helloworld", ".unknown.soft.",
 * "invalid-host-", "invalid-".
 * Example of valid emails: [email protected], [email protected],
 * [email protected], [email protected], [email protected]. */

namespace _03.ExtractEmails
{
    using System;
    using System.Text.RegularExpressions;

    class ExtractEmails
    {
        static void Main(string[] args)
        {
            string text = Console.ReadLine();
            string pattern = @"[A-Za-z]+[.-_]*[A-Za-z]+@[A-Za-z]+[-]*[.A-Za-z]+[A-Za-z]";

            MatchCollection matches = Regex.Matches(text, pattern);
            foreach (Match match in matches)
            {
                Console.WriteLine(match);
            }
        }
    }
}