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当我对长文本使用 TRegEx 并且长文本来自网络时，我遇到了问题！我使用 Indy 获取网页源，然后使用 Regex 查找链接！但是正则表达式无法正常工作的问题！

我的正则表达式：

'/stream_map=(.[^&]*?)&/i'

来源：

const HTTP_RESPONSE_OK = 200;

function GetPage(aURL: string): string;
var
  Response: TStringStream;
  HTTP: TIdHTTP;
begin
  Result := '';
  Response := TStringStream.Create('');
  try
    HTTP := TIdHTTP.Create(nil);
    try
      HTTP.Get(aURL, Response);
      if HTTP.ResponseCode = HTTP_RESPONSE_OK then begin
        Result := Response.DataString;
      end else begin
        // TODO -cLogging: add some logging
      end;
    finally
      HTTP.Free;
    end;
  finally
    Response.Free;
  end;
end;

procedure TForm1.Button1Click(Sender: TObject);
    var 
    regex : TRegEx;
    exper : string;
    result : string;
    fmatch : TMatchCollection;
    begin

    //Edit1.Text = http://www.youtube.com/watch?v=rzADrNmwYI0&feature=player_embedded 
    Memo1.Text := GetPage(Edit1.Text);  
    exper := '/stream_map=(.[^&]*?)&/i';
    regex := TRegEx.Create(exper);
    fmatch := regex.Matches(Memo1.Text);  //Memo1.Text = web pagesource
    ShowMessage(IntToStr(fmatch.Count));
end;

Memo1.Text 包含 youtube 网页的源代码： * 我无法添加整个源代码，但这部分包含 Regex hae 要查找的内容*

<!DOCTYPE html>
  <html lang="ar" dir="rtl" >

<head>
      <script>
var yt = yt || {};yt.timing = yt.timing || {};yt.timing.tick = function(label, opt_time) {var timer = yt.timing['timer'] || {};if(opt_time) {timer[label] = opt_time;}else {timer[label] = new Date().getTime();}yt.timing['timer'] = timer;};yt.timing.info = function(label, value) {var info_args = yt.timing['info_args'] || {};info_args[label] = value;yt.timing['info_args'] = info_args;};yt.timing.info('e', "922401,920704,912806,927201,925706,922403,913546,913556,916805,920201,901451");yt.timing.wff = true;yt.timing.info('an', "");if (document.webkitVisibilityState == 'prerender') {document.addEventListener('webkitvisibilitychange', function() {yt.timing.tick('start');}, false);}yt.timing.tick('start');yt.timing.info('li','0');try {yt.timing['srt'] = window.gtbExternal && window.gtbExternal.pageT() ||window.external && window.external.pageT;} catch(e) {}if (window.chrome && window.chrome.csi) {yt.timing['srt'] = Math.floor(window.chrome.csi().pageT);}if (window.msPerformance && window.msPerformance.timing) {yt.timing['srt'] = window.msPerformance.timing.responseStart - window.msPerformance.timing.navigationStart;}    </script>

<script>var yt = yt || {};yt.preload = {};yt.preload.counter_ = 0;yt.preload.start = function(src) {var img = new Image();var counter = ++yt.preload.counter_;yt.preload[counter] = img;img.onload = img.onerror = function () {delete yt.preload[counter];};img.src = src;img = null;};yt.preload.start("http:\/\/o-o---preferred---sn-apo3qvuoxuxbt-j5pe---v1---lscache6.c.youtube.com\/crossdomain.xml");yt.preload.start("http:\/\/o-o---preferred---sn-apo3qvuoxuxbt-j5pe---v1---lscache6.c.youtube.com\/generate_204?ip=41.130.156.126\u0026upn=kcE458sG0pI\u0026sparams=algorithm%2Cburst%2Ccp%2Cfactor%2Cid%2Cip%2Cipbits%2Citag%2Csource%2Cupn%2Cexpire\u0026fexp=922401%2C920704%2C912806%2C927201%2C925706%2C922403%2C913546%2C913556%2C916805%2C920201%2C901451\u0026mt=1353328753\u0026ms=au\u0026algorithm=throttle-factor\u0026burst=40\u0026ipbits=8\u0026itag=34\u0026sver=3\u0026signature=714099358414A97203AB854A2368EA03C52C15B1.5A59DBDF733A57676263F529B85080CCB60567C0\u0026mv=m\u0026source=youtube\u0026expire=1353352420\u0026key=yt1\u0026factor=1.25\u0026cp=U0hUSFNQUF9HSkNONF9LSlRFOjNUWG00ckdxbFE2\u0026id=af3003acd9b0608d");</script><title>&#x202a;Katyusha - Original Version&#x202c;&rlm; - YouTube</title><link rel="search" type="application/opensearchdescription+xml" href="http://www.youtube.com/opensearch?locale=ar_EG" title="بحث الÙيديو ÙÙŠ YouTube"><link rel="icon" href="http://s.ytimg.com/yts/img/favicon-vfldLzJxy.ico" type="image/x-icon"><link rel="shortcut icon" href="http://s.ytimg.com/yts/img/favicon-vfldLzJxy.ico" type="image/x-icon">   <link rel="icon" href="//s.ytimg.com/yts/img/favicon_32-vflWoMFGx.png" sizes="32x32"><link rel="canonical" href="/watch?v=rzADrNmwYI0"><link rel="alternate" media="handheld" href="http://m.youtube.com/watch?v=rzADrNmwYI0"><link rel="alternate" media="only screen and (max-width: 640px)" href="http://m.youtube.com/watch?v=rzADrNmwYI0"><link rel="shortlink" href="http://youtu.be/rzADrNmwYI0">    <meta name="title" content="Katyusha - Original Version">

    <meta name="description" content="Dedicate to friend &quot;Jenya&quot;. Sung by Lidiya Ruslanova.">

    <meta name="keywords" content="katusha, Lidiya, katyusha, Ruslanova">

    <link rel="alternate" type="application/json+oembed" href="http://www.youtube.com/oembed?url=http%3A%2F%2Fwww.youtube.com%2Fwatch%3Fv%3DrzADrNmwYI0&amp;format=json" title="Katyusha - Original Version">
  <link rel="alternate" type="text/xml+oembed" href="http://www.youtube.com/oembed?url=http%3A%2F%2Fwww.youtube.com%2Fwatch%3Fv%3DrzADrNmwYI0&amp;format=xml" title="Katyusha - Original Version">

      <meta property="og:url" content="http://www.youtube.com/watch?v=rzADrNmwYI0">
    <meta property="og:title" content="Katyusha - Original Version">
    <meta property="og:description" content="Dedicate to friend &quot;Jenya&quot;. Sung by Lidiya Ruslanova.">
    <meta property="og:type" content="video">
    <meta property="og:image" content="http://i3.ytimg.com/vi/rzADrNmwYI0/mqdefault.jpg">
      <meta property="og:video" content="http://www.youtube.com/v/rzADrNmwYI0?version=3&amp;autohide=1">
      <meta property="og:video:type" content="application/x-shockwave-flash">
      <meta property="og:video:width" content="480">
      <meta property="og:video:height" content="360">
    <meta property="og:site_name" content="YouTube">
    <meta property="fb:app_id" content="87741124305">
    <meta name="twitter:card" value="player">
    <meta name="twitter:site" value="@youtube">
      <meta name="twitter:player" value="https://www.youtube.com/embed/rzADrNmwYI0">
      <meta property="twitter:player:width" content="480">
      <meta property="twitter:player:height" content="360">


  <link id="css-3848904683" rel="stylesheet" href="http://s.ytimg.com/yts/cssbin/www-core-rtl-vflG11Gbd.css">

 <script>
    yt.setConfig({
      'VIDEO_ID': "rzADrNmwYI0"    });
    yt.setAjaxToken('watch_actions_ajax', "");

    if (window['gYouTubePlayerReady']) {
      yt.registerGlobal('gYouTubePlayerReady');
    }
  </script>

  <script>
    yt = yt || {};
      yt.playerConfig = {"assets": {"css_actions": "http:\/\/s.ytimg.com\/yts\/cssbin\/www-player-actions-vflJeCcsD.css", "html": "\/html5_player_template", "css": "http:\/\/s.ytimg.com\/yts\/cssbin\/www-player-vfltPqzFT.css", "js": "http:\/\/s.ytimg.com\/yts\/jsbin\/html5player-vflfytLU0.js"}, "url": "http:\/\/s.ytimg.com\/yts\/swfbin\/watch_as3-vfle2krMl.swf", "min_version": "8.0.0", "args": {"is_html5_mobile_device": false, "fexp": "909713,914071,901460,922401,920704,912806,927201,925706,922403,913546,913556,916805,920201,901451", "ptk": "youtube_none", "enablecsi": "1", "allow_embed": 1, "rvs": "view_count=125%2C985\u0026feature_type=fvwp\u0026author=ulaghchi\u0026title=Katyusha\u0026length_seconds=158\u0026featured=1\u0026id=5w0k75NuOdk,view_count=106%2C966\u0026author=etalococh\u0026length_seconds=145\u0026id=h-qTrtu6uS4\u0026title=Joseph+Stalin+dancing+Katyusha,view_count=170%2C742\u0026author=lekutski\u0026length_seconds=289\u0026id=Y-wFYkGvX2c\u0026title=%D0%AE.%D0%A8%D0%B5%D0%B2%D1%87%D1%83%D0%BA-%22%D0%A0%D0%B0%D1%81%D0%BA%D0%B8%D0%BD%D1%83%D0%BB%D0%BE%D1%81%D1%8C+%D0%BC%D0%BE%D1%80%D0%B5+%D1%88%D0%B8%D1%80%D0%BE%D0%BA%D0%BE%22,view_count=2%2C053%2C337\u0026author=Vdovkinanadya\u0026length_seconds=127\u0026id=llS6p4YzsaY\u0026title=%D0%9A%D0%B0%D1%82%D1%8E%D1%88%D0%B0+%28%D0%9A%D0%BE%D0%BD%D1%86%D0%B5%D1%80%D1%82+%22%D0%9F%D0%B5%D1%81%D0%BD%D0%B8+%D0%B2%D0%BE%D0%B5%D0%BD%D0%BD%D1%8B%D1%85+%D0%BB%D0%B5%D1%82%22%29,view_count=553%2C516\u0026author=OdessaNLA\u0026length_seconds=230\u0026id=65RhWzrbqPA\u0026title=%D0%9F%D0%B5%D1%81%D0%BD%D0%B8+%D0%BF%D0%BE%D0%B1%D0%B5%D0%B4%D1%8B+2010+%22%D0%9A%D0%B0%D1%82%D1%8E%D1%88%D0%B0%22+%28%D0%9D%D0%A3+%22%D0%9E%D0%AE%D0%90%22%29,view_count=418%2C833\u0026author=myevro\u0026length_seconds=125\u0026id=rnt-7MWxb8M\u0026title=%D0%9A%D0%B0%D1%82%D1%8E%D1%88%D0%B0-%D0%9C%D0%B0%D1%80%D0%B8%D0%BD%D0%B0+%D0%94%D0%B5%D0%B2%D1%8F%D1%82%D0%BE%D0%B2%D0%B0+%D0%B8+%D0%9A%D0%B0%D1%82%D1%8F+%D0%A0%D1%8F%D0%B1%D0%BE%D0%B2%D0%B0.,view_count=97%2C149\u0026author=muratshawn\u0026length_seconds=196\u0026id=C1KFoJfpiao\u0026title=Katyusha+%2F+%D0%9A%D0%B0%D1%82%D1%8E%D1%88%D0%B0+-+Turkish+%26+Russian+Pride+together%21%21%21,view_count=291%2C062\u0026author=%D0%A2%D0%B0%D1%82%D1%8C%D1%8F%D0%BD%D0%B0+%D0%91%D1%83%D0%BB%D0%B0%D0%BD%D0%BE%D0%B2%D0%B0\u0026length_seconds=139\u0026id=-w-0sFmBo0I\u0026title=%22%D0%9A%D0%B0%D1%82%D1%8E%D1%88%D0%B0%22+%D0%A2.%D0%91%D1%83%D0%BB%D0%B0%D0%BD%D0%BE%D0%B2%D0%B0+%28live%29,view_count=126%2C353\u0026author=SovietMusicLover\u0026length_seconds=175\u0026id=MqgHn27h60c\u0026title=Katyusha+English+Version+%28with+lyrics%29,view_count=645%2C699\u0026author=stmnf\u0026length_seconds=103\u0026id=n0kgtHRGkjk\u0026title=%D0%9A%D0%B0%D1%82%D1%8E%D1%88%D0%B0+%D0%BD%D0%B0+%D0%BA%D0%B8%D1%82%D0%B0%D0%B9%D1%81%D0%BA%D0%BE%D0%BC+%28Katyusha+-+Chinese+version%29,view_count=141%2C603\u0026author=joseeash\u0026length_seconds=181\u0026id=nEUqmMNf6dk\u0026title=%D0%9B%D0%B8%D0%B4%D0%B8%D1%8F+%D0%A0%D1%83%D1%81%D0%BB%D0%B0%D0%BD%D0%BE%D0%B2%D0%B0+%D0%9E%D0%BA%D1%80%D0%B0%D1%81%D0%B8%D0%BB%D1%81%D1%8F+%D0%BC%D0%B5%D1%81%D1%8F%D1%86+%D0%B1%D0%B0%D0%B3%D1%80%D1%8F%D0%BD%D1%86%D0%B5%D0%BC,view_count=161%2C453\u0026author=olegtimes\u0026length_seconds=179\u0026id=bmaRGOa0mz4\u0026title=%D0%A0%D0%B0%D1%81%D0%BA%D0%B8%D0%BD%D1%83%D0%BB%D0%BE%D1%81%D1%8C+%D0%BC%D0%BE%D1%80%D0%B5+%D1%88%D0%B8%D1%80%D0%BE%D0%BA%D0%BE...%28%D0%BF%D0%B0%D0%BC%D1%8F%D1%82%D0%B8+%D0%BC%D0%BE%D0%B5%D0%B3%D0%BE+%D0%B4%D0%B5%D0%B4%D0%B0%29", "vq": "auto", "account_playback_token": "", "autohide": "2", "csi_page_type": "watch5", "keywords": "katusha,Lidiya,katyusha,Ruslanova", "cr": "EG", "fmt_list": "43\/640x360\/99\/0\/0,34\/640x360\/9\/0\/115,18\/640x360\/9\/0\/115,5\/320x240\/7\/0\/0,36\/320x240\/99\/0\/0,17\/176x144\/99\/0\/0", "title": "Katyusha - Original Version", "length_seconds": 178, "feature": "player_embedded", "enablejsapi": 1, "plid": "AATO2QkpPQoh4PMK", "tmi": "1", "watch_xlb": "http:\/\/s.ytimg.com\/yts\/xlbbin\/watch-strings-ar_EG-vfl8x8AOb.xlb", "sdetail": "f:player_embedded,", "url_encoded_fmt_stream_map": 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匹配计数显示“0”

4

1 回答 1

5

在我看来，好像您对正则表达式使用了错误的语法。

'/stream_map=(.[^&]*?)&/i'

看起来像 Perl 正则表达式语法。

对于 Delphi TRegEx，您需要删除斜杠分隔符并通过选项参数指定不区分大小写。像这样：

regex := TRegEx.Create('stream_map=(.[^&]*?)&', [roIgnoreCase]);
于 2012-11-19T19:06:10.863 回答