Csharp/C Sharp by API/System.Text.RegularExpressions/RegexOptions

RegexOptions.IgnoreCase

<source lang="csharp"> using System; using System.Text.RegularExpressions; using System.IO; using System.Text; public class HTMLParser {

   public static void Main(String[] args) {
       FileInfo MyFile = new FileInfo(args[0].ToString());
       if (MyFile.Exists) {
           StreamReader sr = MyFile.OpenText();
           string text = sr.ReadToEnd();
           sr.Close();
           string pattern = @"<a\shref\S*/a>";
           MatchCollection patternMatches = Regex.Matches(text, pattern,
             RegexOptions.IgnoreCase);
           foreach (Match nextMatch in patternMatches) {
               Console.WriteLine(nextMatch.ToString());
           }
       } else
           Console.WriteLine("The input file does not exist");
   }

}

 </source>

RegexOptions.Multiline

<source lang="csharp"> using System; using System.Collections.Generic; using System.Globalization; using System.Text; using System.Text.RegularExpressions; using System.Reflection; public class MainClass{

  public static void Main(){
       Regex r = new Regex(@"(^\d+$\n)+", RegexOptions.Multiline);
       Console.WriteLine(r.Match("987987\n129821").Value);
  }

}

 </source>