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Regular Expressions

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A short Demo showing the use of Regular Expressions in C#.

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  1. using System;
  2. using System.Text.RegularExpressions;
  3.  
  4. namespace regexpressions
  5. {
  6.     class Program
  7.     {
  8.         static void Main(string[] args)
  9.         {
  10.             string content = @"xyz http://www.xyz-xyz.com abc http://www.abc.org def https://www.def.net vwx ftp://fileserver.vwx.org/dot/net";
  11.             string pattern = @"\b\S{1,5}://\S+\.\S{2,}"; //not a good url-pattern - only for demo
  12.  
  13.             //more matches - find the urls
  14.             MatchCollection Matches = Regex.Matches(content, pattern, RegexOptions.IgnoreCase | RegexOptions.ExplicitCapture);
  15.  
  16.             foreach (Match match in Matches)
  17.             {
  18.                 Console.WriteLine(match.ToString());
  19.             }
  20.  
  21.             //one match - find only one (the first) url
  22.             Match oneMatch = Regex.Match(content, pattern, RegexOptions.IgnoreCase | RegexOptions.ExplicitCapture);
  23.  
  24.             Console.WriteLine(oneMatch.ToString());
  25.         }
  26.     }
  27. }

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