Regex and File Stream Example

Regular Expression Vowel Counter

Implementing globalization, drawing, and text manipulation functionality in a.NET Framework application
Regex class
MatchCollection class

Implementing serialization and input / output functionality in a.NET Framework application
FileStream class
StreamReader class
Regex and File Stream Example
using System;
using System.Text.RegularExpressions;
using System.IO;

namespace SimpleRegExExample {
  class Program {
    static void Main(string[] args) {
      // In this example we are going to hit two exam points,
      Regex vowels = new Regex("[aeiou]", RegexOptions.IgnoreCase | RegexOptions.Compiled);
      MatchCollection mc;
      FileStream fs = null;
      StreamReader reader = null;;
      String current_line;
      try {
        fs = new FileStream("FileName.txt", FileMode.Open);
        reader = new StreamReader(fs);
      }
      catch (Exception e) {
        Console.Out.WriteLine(e.Message);
        Console.Out.WriteLine(e.StackTrace);
        if (reader != null) {
          reader.Close();
        }
        if (fs != null) {
          fs.Close();
        }
        return;
      }

      while (!reader.EndOfStream) {
        current_line = reader.ReadLine();
        mc = vowels.Matches(current_line);

        Console.Out.WriteLine("The search term \"" + current_line + "\" has " + mc.Count + " vowels in it");
      }
      reader.Close();
      fs.Close();
    }
  }
}