To Extract Unique/All Sub-Strings from the string

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using System.Collections;

namespace PubishApps
{
class FindSubStringRegex
{

/************************************************
* Topic : To Extract Unique/All Sub-Strings from the string
* Reference Required: System.Text.RegularExpressions.
* Author : kalit sikka
* For : http://eggheadcafe.com
* **********************************************/


///

/// To Extract Unique/All Sub-Strings from the string
///

///
///
///
///

public Match[] FindSubstrings(string source, string matchPattern,
bool findAllUnique)
{
SortedList uniqueMatches = new SortedList( );
Match[] retArray = null;

Regex RE = new Regex(matchPattern, RegexOptions.Multiline);
MatchCollection theMatches = RE.Matches(source);

if (findAllUnique)
{
for (int counter = 0; counter < theMatches.Count; counter++)
{
if (!uniqueMatches.ContainsKey(theMatches[counter].Value))
{

uniqueMatches.Add(theMatches[counter].Value,
theMatches[counter]);
}
}
retArray = new Match[uniqueMatches.Count];
uniqueMatches.Values.CopyTo(retArray, 0);
}
else
{
retArray = new Match[theMatches.Count];
theMatches.CopyTo(retArray, 0);
}

return (retArray);

}


static void Main(string[] args)
{

// Sample Text
string Text=@"Search Tutorials & Message Boards
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string matchPattern = "ASP.NET";



FindSubStringRegex oFind = new FindSubStringRegex();
Console.WriteLine("UNIQUE MATCHES");
Match[] x1 = oFind.FindSubstrings(Text, matchPattern, true);
foreach(Match m in x1)
{
Console.WriteLine(m.Value);
}

Console.WriteLine( );
Console.WriteLine("ALL MATCHES");
Match[] x2 = oFind.FindSubstrings(Text, matchPattern, false);
foreach(Match m in x2)
{
Console.WriteLine(m.Value);
}



}


}
}


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