Csharp/C Sharp/Regular Expressions/Match

Regular expressions: Match

/*
Mastering Visual C# .NET
by Jason Price, Mike Gunderloy
Publisher: Sybex;
ISBN: 0782129110
*/
/*
  ExampleC_1.cs illustrates the use of regular expressions
*/
using System;
using System.Text.RegularExpressions;
public class ExampleC_1 {
  private static void DisplayMatches(string text,
    string regularExpressionString ) {
    Console.WriteLine("using the following regular expression: " +
      regularExpressionString);
    // create a MatchCollection object to store the words that
    // match the regular expression
    MatchCollection myMatchCollection =
      Regex.Matches(text, regularExpressionString);
    // use a foreach loop to iterate over the Match objects in
    // the MatchCollection object
    foreach (Match myMatch in myMatchCollection)
    {
      Console.WriteLine(myMatch);
    }
  }
  public static void Main()
  {
    string text =
      "But, soft! what light through yonder window breaks?\n" +
       "It is the east, and Juliet is the sun.\n" +
       "Arise, fair sun, and kill the envious moon,\n" +
       "Who is already sick and pale with grief,\n" +
       "That thou her maid art far more fair than she";
    // match words that start with "s"
    Console.WriteLine("Matching words that start with "s"");
    DisplayMatches(text, @"\bs\S*");
    // match words that start with "s" and end with "e"
    Console.WriteLine("Matching words that start with "s" and end with "e"");
    DisplayMatches(text, @"\bs\S*e\b");
    // match words that contain two consecutive identical characters
    Console.WriteLine("Matching words that that contain two consecutive identical characters");
    DisplayMatches(text, @"\S*(.)\1\S*");
    // match words that contain "u"
    Console.WriteLine("Matching words that contain "u"");
    DisplayMatches(text, @"\S*u+\S*");
    // match words that contain the pattern "ai"
    Console.WriteLine("Matching words that contain the pattern "ai"");
    DisplayMatches(text, @"\S*(ai)\S*");
    // match words that contain the pattern "ai" or "ie"
    Console.WriteLine("Matching words that contain the pattern "ai" or "ie"");
    DisplayMatches(text, @"\S*(ai|ie)\S*");
    // match words that contain "k" or "f"
    Console.WriteLine("Matching words that contain "k" or "f"");
    DisplayMatches(text, @"\S*[kf]\S*");
    // match words that contain any letters in the range "b" through "d"
    Console.WriteLine("Matching words that contain any letters in the range "b" through "d"");
    DisplayMatches(text, @"\S*[b-d]\S*");
  }
}