Re: extracting urls

From:
SadRed <cardinal_ring@yahoo.co.jp>
Newsgroups:
comp.lang.java.programmer
Date:
Sat, 17 Nov 2007 21:53:21 -0800 (PST)
Message-ID:
<8d6624e5-d115-4c13-8cf3-d24927f91585@e25g2000prg.googlegroups.com>
On Nov 18, 9:01 am, mnml <rdelsa...@gmail.com> wrote:

Hi, I made a little function to extract urls from any content with a
regular expression but it doesn't really work.
when i try to extract urls fromhttp://google.comi only get 4 results
in my array:

*http://images.google.nl/imghp?oe=ISO-8859-1&hl=nl&tab=wi
* http://
* .nl
* /imghp?oe=ISO-8859-1&hl=nl&tab=wi

Here is the code of my function:

public static void find_url(String content) {
        Pattern p = Pattern.compile("(@)?(http://)?[a-zA-Z_0-9\\-]+(\\.\\w[a-
zA-Z_0-9\\-]+)+(/[#&\\n\\-=?\\+\\%/\\.\\w]+)?");

        Matcher m = p.matcher(content);

        if (m.find())
        {
         for (int i=0; i<=m.groupCount(); i++) {
                        myVar.urls[i] = m.group(i);
                        }
        }

}


Don't clutter the forum with your multi posts, please!
Your regex code is very wrong. Study this code and go to bed. I didn't
touch your weird regex string but I firmly believe it is also wrong
for your desired purpose which I don't know in its details.
----------------------------------------------
import java.net.*;
import java.util.regex.*;
import java.io.*;
import java.util.*;

public class Mnm{

  public static void main(String[] args) throws Exception{
    String contStr = "";
    String line = null;

    Locale.setDefault(Locale.US);
    // String urlStr = "http://google.com";
    String urlStr = "http://www.google.com/ig?hl=en";

    if (args.length > 0){
      urlStr = args[0];
    }

    URL url = new URL(urlStr);
    InputStream is = url.openStream();

    BufferedReader br = new BufferedReader(new InputStreamReader(is));
    while ((line = br.readLine()) != null){
      contStr += line;
    }

    findUrl(contStr);
  }

  public static void findUrl(String content) {
    int gc, counter, gcounter;
    gc = counter = gcounter = 0;

    Pattern p = Pattern.compile
("(@)?(http://)?[a-zA-Z_0-9\\-]+(\\.\\w[a-zA-Z_0-9\\-]+)+(/[#&\\n\\-=?\
\+\\%/\\.\\w]+)?");

    Matcher m = p.matcher(content);
    gc = m.groupCount();
    for (int i = 0; i <= gc; ++i){
      System.out.println("GROUP" + i + " : ");
      while (m.find()){
        ++counter;
        ++gcounter;
        System.out.println(gcounter + ".> " + m.group(i));
      }
      m.reset(content); // for next group
      gcounter = 0;
    }
    if (counter == 0){
      System.out.println("--no match--");
    }
  }
}
----------------------------------------

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