lala

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net;
using System.Text;
using System.Text.RegularExpressions;

namespace http_request
{
    class HttpRequester
    {
        public HttpRequester()
        {
            ServicePointManager.ServerCertificateValidationCallback = (s, cert, chain, ssl) => true;
        }
        public IEnumerable<String> getImagesLink(Uri uri)
        {
            //Список ссылок на выход
            List<String> list = new List<string>();
            String response = getResponse(uri);
            //
            String condition = "<\\s*img\\s+src\\s?=\\s?\"(?:(?:(?<scheme>http[s]?|ftp[s]?)?(?::)?\\/\\/)?" +
                "(?<host>(?:[^:\\/\\s]+\\.[^:\\/\\s]+)|(?:localhost))(?::)?(?<port>\\d+)?)?(?:\\/)?(?<path>[^\"]+)\"";
            Regex regex = new Regex(condition, RegexOptions.IgnoreCase);
            MatchCollection matches = regex.Matches(response);
            UriBuilder parsedUri;
            foreach (Match match in matches)
            {
                parsedUri = new UriBuilder();
                parsedUri.Scheme = !String.IsNullOrEmpty(match.Groups["scheme"].Value) ? match.Groups["scheme"].Value : uri.Scheme;
                parsedUri.Host = !String.IsNullOrEmpty(match.Groups["host"].Value) ? match.Groups["host"].Value : uri.Host;
                parsedUri.Port = !String.IsNullOrEmpty(match.Groups["port"].Value) ? Convert.ToInt32(match.Groups["port"].Value) : uri.Port;
                parsedUri.Port = parsedUri.Port == 80 ? -1 : parsedUri.Port;
                parsedUri.Path = match.Groups["path"].Value;
                list.Add(parsedUri.ToString());
            }
            return list;
        }
        private String getResponse(Uri uri)
        {
            String response = String.Empty;
            try
            {
                HttpWebRequest req = (HttpWebRequest)HttpWebRequest.Create(uri);
                HttpWebResponse resp = (HttpWebResponse)req.GetResponse();
                using (StreamReader stream = new StreamReader(
                     resp.GetResponseStream(), Encoding.UTF8))
                {
                    response = stream.ReadToEnd();
                }
            }
            catch (WebException ex)
            {
                return null;
            }
            return response;
        }
    }
}