How to use the Regex class in a regular expression?

How to use the Regex class in a regular expression?

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Take the following steps to use the Regex class in a regular expression :

1. Implement the following namespace:
   
   using System.Text.RegularExpressions;



2. Create a Regex class object as follows:
   
   Regex reg = new Regex(@"\b(?<word>\w+)\s+(\k<word>)\b",
   RegexOptions.Compiled | RegexOptions.IgnoreCase);
   //Regular expression to check duplicate values in the string;
   


3. Create a string object and initialize it as follows:
   
   string text = "This is uCertify.com Prepkit questions Prepkit uCertify and uCertify";
   


4. Create a MatchCollection object to find a match as follows:
   
   MatchCollection matches = reg.Matches(text);
   
   
5. Display the number of matches found as follows:
   
   Console.WriteLine("No. Of Matches Found -", matches.Count);
   
   
6. Display information about each match found as follows:
   
   foreach (Match match in matches)
   {
   string myword = match.Groups["word"].Value;
   int i = match.Index;
   Console.WriteLine("{0} Repeated At The Position {1}", myword, i);
   }
   

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