Task: Rosetta Code_Count examples
C#: using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;
using System.Net;

class Task {
    private string _task;
    private int _examples;

    public Task(string task, int examples) {
        _task = task;
        _examples = examples;
    }

    public string Name {
        get { return _task; }
    }

    public int Examples {
        get { return _examples; }
    }

    public override string ToString() {
        return String.Format("{0}: {1} examples.", this._task, this._examples);
    }
}

class Program {
    static List<string> GetTitlesFromCategory(string category, WebClient wc) {
        string content = wc.DownloadString(
            String.Format("http:
        );

        return new Regex("\"title\":\"(.+?)\"").Matches(content).Cast<Match>().Select(x => x.Groups[1].Value.Replace("\\/", "/")).ToList();
    }

    static string GetSourceCodeFromPage(string page, WebClient wc) {
        return wc.DownloadString(
            String.Format("http:
        );
    }

    static void Main(string[] args) {
        WebClient wc = new WebClient();
        List<Task> tasks = new List<Task>();
        List<string> tasknames = GetTitlesFromCategory("Programming_Tasks", wc);

        foreach (string task in tasknames) {
            try {
                string content = GetSourceCodeFromPage(WebUtility.UrlEncode(task), wc);
                int count = new Regex("=={{header", RegexOptions.IgnoreCase).Matches(content).Count;
                Task t = new Task(task, count);

                Console.WriteLine(t);
                tasks.Add(t);
            }
            catch (Exception ex) {
                Console.WriteLine("****            Unable to get task \"" + task + "\": " + ex.Message);
            }
        }

        Console.WriteLine("\nTotal: {0} examples.", tasks.Select(x => x.Examples).Sum());
    }
}

Java: import java.util.ArrayList;
import ScreenScrape;

public class CountProgramExamples {
    private static final String baseURL = "http:
    private static final String rootURL = "http:
        + "api.php?action=query&list=categorymembers"
        + "&cmtitle=Category:Programming_Tasks&cmlimit=500&format=xml";
    private static final String taskBegin = "title=\"";
    private static final String taskEnd = "\"";
    private static final String exmplBegin = "<span class=\"tocnumber\">";
    private static final String exmplEnd = "</span>";
    private static final String editBegin = "<span class=\"editsection\">";

    
    public static void main(String[] args) {
        int exTotal = 0;
        try {
            
            ArrayList<String> tasks = new ArrayList<String>();
            ScreenScrape ss = new ScreenScrape();
            String rootPage = ss.read(rootURL);
            while (rootPage.contains(taskBegin)) {
                rootPage = rootPage.substring(rootPage.indexOf(taskBegin)
                    + taskBegin.length());
                String title = rootPage.substring(0, rootPage.indexOf(taskEnd));
                if (!title.contains("Category:")) {
                    tasks.add(title);
                }
                rootPage = rootPage.substring(rootPage.indexOf(taskEnd));
            }
            
            for (String task : tasks) {
                String title = task.replaceAll("&#039;", "'");
                String taskPage = ss.read(baseURL + title.replaceAll(" ", "_"));
                int exSubTot;
                if (taskPage.contains(exmplBegin)) {
                    int startPos = taskPage.lastIndexOf(exmplBegin)
                        + exmplBegin.length();
                    String countStr = taskPage.substring(startPos,
                        taskPage.indexOf(exmplEnd, startPos));
                    exSubTot = Integer
                        .parseInt(countStr.contains(".") ? countStr
                            .substring(0, countStr.indexOf("."))
                            : countStr);
                } else {
                    exSubTot = 0;
                    while (taskPage.contains(editBegin)) {
                        taskPage = taskPage.substring(taskPage
                            .indexOf(editBegin) + editBegin.length());
                        exSubTot++;
                    }
                }
                exTotal += exSubTot;
                System.out.println(title + ": " + exSubTot + " examples.");
            }
            
            System.out.println("\nTotal: " + exTotal + " examples.");
        } catch (Exception e) {
            System.out.println(title);
            System.out.println(startPos + ":"
                + taskPage.indexOf(exmplEnd, startPos));
            System.out.println(taskPage);
            e.printStackTrace(System.out);
        }
    }
}