static void Main(string[] args)        {            string atxet = @"
 32323
     
 323343434
";            Regex reg = new Regex(@"http://([a-zA-Z0-9-/ _]+)+.(gif|png|jpg)", RegexOptions.IgnoreCase);            MatchCollection matchs = reg.Matches(atxet);            foreach (Match item in matchs)            {                if (item.Success)                {                    Console.WriteLine(item.Value); //这里就是匹配到的项                 }            }            Console.Read();        }