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Match words that contain k or f

using System; using System.Text.RegularExpressions; class MainClass {   private static void DisplayMatches(string text,string regularExpressionString) {     Console.WriteLine("using the following regular expression: " +regularExpressionString);     MatchCollection myMatchCollection = Regex.Matches(text, regularExpressionString);     foreach (Match myMatch in myMatchCollection) {       Console.WriteLine(myMatch);     }   }   public static void Main() {     string text ="knife knock five";          Console.WriteLine("Matching words that contain 'k' or 'f'");     DisplayMatches(text, @"\S*[kf]\S*");   } } Matching words that contain 'k' or 'f' using the following regular expression: \S*[kf]\S* knife knock five