using System;

using System.Text.RegularExpressions;

public class Program

{

    public static void Main()

    {

        /*Looking for position*/

        Console.WriteLine("Postion\n");

        Regex reg = new Regex("the");

        string str1 = "the quick brown fox jumped over the lazy dog";

        MatchCollection matchSet;

        matchSet = reg.Matches(str1);

        if (matchSet.Count > 0){

        foreach (Match aMatch in matchSet)

        Console.WriteLine("found a match at: " + aMatch.Index);

        /*Matching with rules*/

        Console.WriteLine("\n==================\n");

        Console.WriteLine("QUANTIFIERS:\n");

        Console.WriteLine("+\n");

        string[] words = new string[] {"bad", "boy", "baaad","bear", "bend","baad"};

        foreach (string word in words)

        if (Regex.IsMatch(word, "ba+"))

        Console.WriteLine(word);

        Console.WriteLine("\n{n}\n");

        foreach (string word in words)

        if (Regex.IsMatch(word, "ba{2}d"))

        Console.WriteLine(word);

        Console.WriteLine("\n");

        foreach (string word in words)

        if (Regex.IsMatch(word, "ba{1,3}d"))

        Console.WriteLine(word);

        Console.WriteLine("\n==================\n");

        Console.WriteLine("Match word, we want to get <b> only \n");

        string[] wordss = new string[]{"Part", "of", "this","<b>string</b>", "is", "bold"};

        string regExp = "<.*>";

        MatchCollection bMatch;

        foreach (string word in wordss) {

        if (Regex.IsMatch(word, regExp)) {

        bMatch = Regex.Matches(word, regExp);

        for(int i = 0; i < bMatch.Count; i++)

        Console.WriteLine(bMatch[i].Value);}}

        Console.WriteLine("\nfixed\n");

        regExp = "<.*?>";

        foreach (string word in wordss) {

        if (Regex.IsMatch(word, regExp)) {

        bMatch = Regex.Matches(word, regExp);

        for(int i = 0; i < bMatch.Count; i++)

        Console.WriteLine(bMatch[i].Value);}}

        Console.WriteLine("\n==================\n");

        Console.WriteLine("Match postiong:\n");

        /*Looking for position*/

        string str2 = "the quick brown fox jumped over thelazy dog";

        matchSet = Regex.Matches(str2, ".");

        foreach (Match cMatch in matchSet)

        Console.WriteLine("matches at: " + cMatch.Index);

        Console.WriteLine("\n==================\n");

        Console.WriteLine("Match postiong with rule:\n");

        str2 = "THE quick BROWN fox JUMPED over THE lazy DOG";

        matchSet = Regex.Matches(str2, "[a-z]");

        foreach (Match cMatch in matchSet)

        Console.WriteLine("Matches at: " + cMatch.Index);

        Console.WriteLine("\n==================\n");

        words = new string[]{"heal", "heel","noah", "techno"};

        Console.WriteLine("start with h\n");

        regExp = "^h";

        Match dMatch;

        foreach (string word in words){

        if (Regex.IsMatch(word, regExp)) {

        dMatch = Regex.Match(word, regExp);

        Console.WriteLine("Matched: " + word + " at position: " + dMatch.Index);}}

        Console.WriteLine("\nEnd with h\n");

        regExp = "h$";

        foreach (string word in words){

        if (Regex.IsMatch(word, regExp)) {

        dMatch = Regex.Match(word, regExp);

        Console.WriteLine("Matched: " + word + " at position: " + dMatch.Index);}}

        Console.WriteLine("\n");    

        Console.WriteLine("\n==================\n");

        Console.WriteLine("Grouping\n");

        string words1 = "08/14/57 46 02/25/59 45 06/05/85 18" +"03/12/88 16 09/09/90 13";

        string regExp1 = "(\\s\\d{2}\\s)";

        matchSet = Regex.Matches(words1,regExp1);

        foreach (Match aMatch in matchSet)

        Console.WriteLine(aMatch.Groups[0].Captures[0]);

        Console.WriteLine("\nNamed Grouping\n");

        regExp1 = "(?<dates>(\\d{2}/\\d{2}/\\d{2}))\\s";

        matchSet = Regex.Matches(words1,regExp1);

        foreach (Match aMatch in matchSet)

        Console.WriteLine("Date: {0}", aMatch.Groups["dates"]);

        Console.WriteLine("\n==================");

        string dates = "08/14/57 46 02/25/59 45 06/05/85 18 " + "03/12/88 16 09/09/90 13";

        regExp ="(?<dates>(\\d{2}/\\d{2}/\\d{2}))\\s(?<ages>(\\d{2}))\\s";

        matchSet = Regex.Matches(dates, regExp);

        Console.WriteLine();

        foreach (Match aMatch in matchSet) {

        foreach (Capture aCapture in aMatch.Groups["dates"].Captures)

        Console.WriteLine("date capture: " +aCapture.ToString());

        foreach (Capture aCapture in aMatch.Groups["ages"].Captures)

            Console.WriteLine("age capture: " +aCapture.ToString());}

        }

    }

}