18.Task: Maching_emails

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading.Tasks;

namespace _18.Task
{
    class Program
    {
        static void Main(string[] args)
        {
            //Task 18: Write a program for extracting all email addresses from given text.
            //All substrings that match the format <identifier>@<host>…<domain> should be recognized as emails.

            string inputText = "Please contact us by phone (+359 222 222 222) or by email at example@abv.bg or at baj.ivan@yahoo.co.uk. This is not email: test@test. This also: @telerik.com. Neither this: a@a.b.";
            string pattern = @"\b[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,4}\b";
            List<string> resultList = new List<string>();
            Match regex = Regex.Match(inputText, pattern, RegexOptions.IgnoreCase);

            while (true)
            {
                if (regex.Success)
                {
                    string result = regex.Value;
                    resultList.Add(result);
                }
                else
                {
                    break;
                }
                regex = regex.NextMatch();
            }

            foreach (var item in resultList)
            {
                Console.WriteLine(item);
            }
        }
    }
}