RegularExpresion (fast question)

Question

4.00/5 (1 vote)

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Hi. I can't get my RegEx results. So here's a little code snipet what I have made. This code is exact the same like in my not working project. :)

Code:

   string url = string.Format("http://www.google.lv/search?hl=lv&q=roze%23&bav=on.2,or.r_gc.r_pw.&um=1&ie=UTF-8&tbm=isch&source=og&sa=N&tab=wi&sout=1&biw=1280&bih=651");
   WebClient wb = new WebClient();
   string content = wb.DownloadString(url);

   Regex reg = new Regex(@"imgres\?imgurl.*?(,""){5}");

   MatchCollection mm = reg.Matches(content);

   foreach (Match item in mm)
   {
       Console.WriteLine(item.ToString());
   }
Console.ReadLine();

I download google image page content. I use RegEx to get some string for my future activitys. But it just don't work. This reg I build in "RegExBuilder" app. and it showes me 21 match.
In VS 2010 -> No match! :)
So can anyone tell me -> Why it doesn't work?
Thanks!

P.S. In my time zone it is 1:20. I will answer in morning :)

Posted 30-May-11 12:22pm

valza

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yesotaso · Accepted Answer · 2011-05-30T15:06:00

Solution 1

C#

//Get related text block
string subContent = Regex.Match(content,@"(?<=dyn.setResults\(\[).*?(?=\]\);)").Value;
// Get rid of empty lists
subContent = subContent.Replace("[],", "");
// Get list of images
MatchCollection mc = Regex.Matches(subContent , @"(?<=\[).*?(?=\])");
// Now mc holds your 21 results
foreach(System.Text.RegularExpressions.Match m in mc)
{
    // Split parameters of dyn.setResults
    string[] args = m.Value.Split(',');
    // 4th value of args hold your image url
}

Quite dirty but, hope it helps.

Posted 30-May-11 15:06pm

yesotaso

Updated 30-May-11 15:57pm

v2

Comments

valza 31-May-11 1:15am

Yes, it works.
Can you give me a short comment. Why my code didn't work? What was wrong? :)

yesotaso 31-May-11 4:40am

Well, the logic behind your pattern is a little bit insufficient. I dont know how it seemed to work in the first place. As you can see I did not search for "imgres?imgurl", yes that is close to result but if you dont pinpoint exact location of goodies in someoneelse's string you'd waste quite a bit of time searching your way. So the brackets '[' ']' are the key to pinpoint target you should have looked for those.

valza 31-May-11 5:37am

Yes, thanks! before you post answer I did some work, to understand your code.

Again Thanks.