Regular Expression Pocket Reference, 2nd Edition

Examples

Example 1-9. Simple match

//Find Spider-Man, Spiderman, SPIDER-MAN, etc.
namespace Regex_PocketRef
{
  using System.Text.RegularExpressions;

  class SimpleMatchTest
  {
    static void Main( )
    {
      string dailybugle = "Spider-Man Menaces City!";

      string regex = "spider[- ]?man";
      if (Regex.IsMatch(dailybugle, regex, RegexOptions.
IgnoreCase)) {
      //do something
    }
  }
}

Example 1-10. Match and capture group

//Match dates formatted like MM/DD/YYYY, MM-DD-YY,...
using System.Text.RegularExpressions;

class MatchTest
 {
  static void Main( )
    {
    string date = "12/30/1969";
    Regex r =
       new Regex( @"^(\d\d)[-/](\d\d)[-/](\d\d(?:\d\d)?)$" );

    Match m = r.Match(date);

    if (m.Success) {
      string month = m.Groups[1].Value;
      string day   = m.Groups[2].Value;
      string year  = m.Groups[3].Value;
    }
  }
}

Example 1-11. Simple substitution

//Convert <br> to <br /> for XHTML compliance
using System.Text.RegularExpressions;

class SimpleSubstitutionTest
 {
  static void Main( )
   {
    string text = "Hello world. <br>";
    string regex = "<br>";
    string replacement = "<br />";

    string result =
       Regex.Replace(text, regex, replacement, RegexOptions.
IgnoreCase);
  }
}

Example 1-12. Harder substitution

//urlify - turn URLs into HTML links using System.Text.RegularExpressions; public class Urlify { static Main ( ) { string text = "Check the web site, http://www.oreilly.com/ catalog/regexppr."; string regex = @"\b # start at word boundary ( # capture to $1 (https?|telnet|gopher|file|wais|ftp) : # resource and colon [\w/#~:.?+=&%@!\-] +? # one or ...