Regular Expressions 101

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using System;
using System.Text.RegularExpressions;

public class Example
{
    public static void Main()
    {
        string pattern = @"<a\s+.*?href=""https:\/\/code.amazon.com\/packages\/AWSBrewPricingPlcConsole\/releases\/(\d+)\.(\d+)\.(\d+)\.(\d+)";
        string input = @"




<!DOCTYPE HTML PUBLIC ""-//W3C//DTD HTML 4.01//EN""
            ""http://www.w3.org/TR/html4/strict.dtd"">
<html>

<head>
  <title>
    AWSBrewPricingPlcConsole - Releases - Brazil Directory
  </title>

  

<!-- EXPERIMENTAL: Subject to change, don't rely on these -->
<meta name=""environment"" content=""DevCentralWebsite"">
<meta name=""stage""       content=""Prod"">
<!-- /EXPERIMENTAL -->


  <link rel=""stylesheet""
        type=""text/css""
        href=""https://internal-cdn.amazon.com/dtux.amazon.com/stylesheets/dtux-style.css"">

  <link href=""https://internal-cdn.amazon.com/devcentral.amazon.com/style/helptips.css""
        rel=""stylesheet""
        type=""text/css"">

  <link rel=""icon""
        href=""https://internal-cdn.amazon.com/devcentral.amazon.com/images/brazil.ico""
        type=""image/x-icon"">
  <link rel=""shortcut icon""
        href=""https://internal-cdn.amazon.com/devcentral.amazon.com/images/brazil.ico""
        type=""image/x-icon"">

  <link rel=""stylesheet""
        type=""text/css""
        href=""https://internal-cdn.amazon.com/btk.amazon.com/ajax/libs/jquery/plugins/autocomplete/1.1/jquery.autocomplete.min.css"">

  <link href=""https://internal-cdn.amazon.com/devcentral.amazon.com/brazil/directory/stylesheet.min.css?size=24097""
        rel=""stylesheet""
        type=""text/css"">

  <link rel=""stylesheet"" type=""text/css"" href=""https://internal-cdn.amazon.com/devcentral.amazon.com/brazil/directory/visualizer/stylesheets/visualizer.min.css?size=1088"" >

  <link rel=""stylesheet""
        type=""text/css""
        href=""https://internal-cdn.amazon.com/is-it-down.amazon.com/stylesheets/stripe.css"">

  <script type=""text/javascript""
          src=""https://internal-cdn.amazon.com/btk.amazon.com/ajax/libs/jquery/1.7.2/jquery.min.js""></script>
  <script type=""text/javascript""
          src=""https://internal-cdn.amazon.com/dtux.amazon.com/javascripts/cache/dtux-style.js""></script>
  <script type=""text/javascript""
          src=""https://internal-cdn.amazon.com/btk.amazon.com/ajax/libs/jquery/plugins/autocomplete/1.1/jquery.autocomplete.min.js""></script>
  <script type=""text/javascript""
          src=""https://internal-cdn.amazon.com/btk.amazon.com/ajax/libs/jquery/plugins/tablesorter/2.0.3/jquery.tablesorter.min.js""></script>

  <script type=""text/javascript""
          src=""https://internal-cdn.amazon.com/devcentral.amazon.com/brazil/directory/script.min.js?size=2302"">
  </script>

  <script type=""text/javascript"">
      IS_PROD = true;
      REMOTE_USER = 'vladyang';
  </script>

</head>

<body>
<div id=""content"">
  <div class=""inner-container"">

  <div class=""indexHeader"">
    <span class='titleBarTitle'>
          
<a href=""/"">devcentral</a> &gt;

    <a href=""https://devcentral.amazon.com/ac/brazil/directory/"">brazil directory</a>
    &gt; 
    <a href=""https://devcentral.amazon.com/ac/brazil/directory/packages/by-owner"">packages</a> &gt; <a href=""https://devcentral.amazon.com/ac/brazil/directory/package/overview/AWSBrewPricingPlcConsole"">AWSBrewPricingPlcConsole</a> &gt; <a href=""https://devcentral.amazon.com/ac/brazil/directory/package/majorVersionSummary/AWSBrewPricingPlcConsole?majorVersion=1.3"">1.3</a> &gt; release notes

    </span>
  </div>

  <div class='titleBarHelper'>
    
  <div id=""searchBoxes"">
    
    
    <form action=""https://devcentral.amazon.com/ac/brazil/directory/packages/search""
          id=""findPackageForm"">
      <div>
        Search Packages:
        <input type=""text"" id=""findPackage"" name=""q"">
        </div>
    </form>

    
    
    <form action=""https://devcentral.amazon.com/ac/brazil/directory/version-sets/search""
          id=""findVersionSetForm"">
      <div>
        Search Version Sets:
        <input type=""text""
               id=""findVersionSet""
               class=""versionSetInput""
               name=""q""
               value=""live"">
      </div>
    </form>

  </div>

  </div>

  <h1>Package: AWSBrewPricingPlcConsole</h1>

  
  

<!--
Timing for addPackageToRoute (in seconds):
{
  'getBranchByPackageAndName' => '0.0113730430603027',
  'getPackageSynopsisByName' => '0.0839250087738037'
}

-->

<div id=""viewInLinks"">
View in
          <a href=""/brazil/go/src-control?pkg=AWSBrewPricingPlcConsole"">Code Browser</a>
        |
        <a href=""https://omni-grok.amazon.com/s?path=/AWSBrewPricingPlcConsole&indexName=GitFarm_6"">OmniGrok</a>

        |
        <a href=""https://apollo.amazon.com/package.html?packageName=AWSBrewPricingPlcConsole&amp;showEnvironmentUsage=1"">
          Apollo
        </a>
</div>


   <div id=""headerWarning"">
     

   </div>

  <div id=""flash"">
    
    
    


  </div>

  
         
  
<div class=""tabs has-subnav"">
<ul>
  <li class=""tab ""><a class="" ""
                     href=""https://devcentral.amazon.com/ac/brazil/directory/package/overview/AWSBrewPricingPlcConsole"">Overview</a></li>
  <li class=""tab ""><a class="" ""
                     href=""https://devcentral.amazon.com/ac/brazil/directory/package/branches/AWSBrewPricingPlcConsole"">Branches</a></li>
  <li class=""tab ""><a class="" ""
                     href=""https://devcentral.amazon.com/ac/brazil/directory/package/releases/AWSBrewPricingPlcConsole"">All Releases</a></li>
  <li class=""tab ""><a class="" ""
                     href=""https://devcentral.amazon.com/ac/brazil/directory/package/sourceGuidance/AWSBrewPricingPlcConsole"">Source Guidance</a></li>
  <li class=""tab active""><a class=""active vendor-guidance-NONE""
                     href=""https://devcentral.amazon.com/ac/brazil/directory/package/majorVersionSummary/AWSBrewPricingPlcConsole?majorVersion=1.3"">1.3 </a></li>
  <li class=""tab ""><a class="" vendor-guidance-NONE""
                     href=""https://devcentral.amazon.com/ac/brazil/directory/package/majorVersionSummary/AWSBrewPricingPlcConsole?majorVersion=1.0"">1.0 </a></li>
</ul>
</div>

       
  
<div class=""subtabs"">
<ul>
  <li class=""subtab ""><a class="" ""
                     href=""https://devcentral.amazon.com/ac/brazil/directory/package/majorVersionSummary/AWSBrewPricingPlcConsole?majorVersion=1.3"">Summary</a></li>
  <li class=""subtab active""><a class=""active ""
                     href=""https://devcentral.amazon.com/ac/brazil/directory/package/notes/AWSBrewPricingPlcConsole?majorVersion=1.3"">Releases</a></li>
  <li class=""subtab ""><a class="" ""
                     href=""https://devcentral.amazon.com/ac/brazil/directory/package/deps/AWSBrewPricingPlcConsole?direction=down&majorVersion=1.3&graphType=runtime_dependencies-resolved"">Dependencies</a></li>
  <li class=""subtab ""><a class="" ""
                     href=""https://devcentral.amazon.com/ac/brazil/directory/package/deps/AWSBrewPricingPlcConsole?direction=up&majorVersion=1.3"">Consumers</a></li>
</ul>
</div>




  <div class='underNav'>
    <div class=""subNavHolder"">









<div id=""actions"">
  <h3>Package Actions</h3>


  
<form method=""get""
      action=""/brazil/packages/versionDiff/"">
  <div>
    <input type=""hidden"" name=""packageName"" value=""AWSBrewPricingPlcConsole"">
    <button type=""submit"">
      Diff <b>Versions</b>
    </button>
  </div>
</form>

</div>
  








<h2>Releases</h2>

<div class=""releaseNotes"">
<table class=""releaseNotes"">
  <tr>
    <td class=""version"">
      <a name=""1.3.3.0""></a><a href=""https://code.amazon.com/packages/AWSBrewPricingPlcConsole/releases/1.3.3.0""><b>1.3</b>.3.0</a>
    </td>
    <td class=""nowrap"">Tue Jan  8 01:39:08 2019</td>
    <td>
      AWSBrewPricingPlcConsole/<a href=""/brazil/go/src-control?branch=mainline&pkg=AWSBrewPricingPlcConsole"">mainline</a>@<a href=""/brazil/go/src-control?branch=mainline&cln=6a10a7b2e3108941009efcfaef877b0df6a4063a&pkg=AWSBrewPricingPlcConsole"">6a10a7b2e3108941009efcfaef877b0df6a4063a</a>&nbsp;(GitFarm)
    </td>
    <td>
      <a href=""https://devcentral.amazon.com/ac/brazil/directory/version-set/overview/AWSBrewPricingPlcTools/AWSBrewPricingPlcConsole"">AWSBrewPricingPlcTools/AWSBrewPricingPlcConsole</a>
    </td>
    <td style=""width: 50%"">
      Built in <a href=""https://build.amazon.com/2058367784"">request 2058367784</a>
    </td>

  </tr>
  <tr>
    <td colspan=""5"" class=""text"">
      <div style=""overflow: auto"">
      Requester: vladyang<br>
      [Change 6a10a7b2e3108941009efcfaef877b0df6a4063a by vladyang] adding version info<br>
<br>

      </div>
    </td>
  </tr>
  <tr>
    <td class=""version"">
      <a name=""1.3.2.0""></a><a href=""https://code.amazon.com/packages/AWSBrewPricingPlcConsole/releases/1.3.2.0""><b>1.3</b>.2.0</a>
    </td>
    <td class=""nowrap"">Tue Jan  8 01:20:29 2019</td>
    <td>
      AWSBrewPricingPlcConsole/<a href=""/brazil/go/src-control?branch=mainline&pkg=AWSBrewPricingPlcConsole"">mainline</a>@<a href=""/brazil/go/src-control?branch=mainline&cln=3d728050bff78d98870ca70662e62bebbfa91f48&pkg=AWSBrewPricingPlcConsole"">3d728050bff78d98870ca70662e62bebbfa91f48</a>&nbsp;(GitFarm)
    </td>
    <td>
      <a href=""https://devcentral.amazon.com/ac/brazil/directory/version-set/overview/AWSBrewPricingPlcTools/AWSBrewPricingPlcConsole"">AWSBrewPricingPlcTools/AWSBrewPricingPlcConsole</a>
    </td>
    <td style=""width: 50%"">
      Built in <a href=""https://build.amazon.com/2058362893"">request 2058362893</a>
    </td>

  </tr>
  <tr>
    <td colspan=""5"" class=""text"">
      <div style=""overflow: auto"">
      Requester: vladyang<br>
      [3d72805 by vladyang]     Initial Test Set
      </div>
    </td>
  </tr>
  <tr>
    <td class=""version"">
      <a name=""1.3.1.0""></a><a href=""https://code.amazon.com/packages/AWSBrewPricingPlcConsole/releases/1.3.1.0""><b>1.3</b>.1.0</a>
    </td>
    <td class=""nowrap"">Tue Jan  8 00:50:19 2019</td>
    <td>
      AWSBrewPricingPlcConsole/<a href=""/brazil/go/src-control?branch=refactorings&pkg=AWSBrewPricingPlcConsole"">refactorings</a>@<a href=""/brazil/go/src-control?branch=refactorings&cln=afcb73f4968c4fc6baf6beb85f8414ad1a2ab603&pkg=AWSBrewPricingPlcConsole"">afcb73f4968c4fc6baf6beb85f8414ad1a2ab603</a>&nbsp;(GitFarm)
    </td>
    <td>
      <a href=""https://devcentral.amazon.com/ac/brazil/directory/version-set/overview/AWSBrewPricingPlcTools/AWSBrewPricingPlcConsole"">AWSBrewPricingPlcTools/AWSBrewPricingPlcConsole</a>
    </td>
    <td style=""width: 50%"">
      Built in <a href=""https://build.amazon.com/2058354122"">request 2058354122</a>
    </td>

  </tr>
  <tr>
    <td colspan=""5"" class=""text"">
      <div style=""overflow: auto"">
      Requester: vladyang<br>
      [afcb73f by vladyang] Fixing package versioning
      </div>
    </td>
  </tr>
</table>
</div>

<a name=""end""></a>


<script type=""text/javascript""
        src=""https://internal-cdn.amazon.com/devcentral.amazon.com/brazil/directory/js/package.min.js?size=1292""></script>




      <div style=""clear:both""></div>
    </div>
  </div>
  </div>
</div>

  <div id='footer'>
      <div class='column'>
        <h3>Packages</h3>
        <ul>
          <li><a href=""https://octane.amazon.com/package"">Create Package</a></li>
          <li><a href=""/brazil/packages"">Third Party Packages</a></li>
          <li><a href=""https://code.amazon.com/packages/find_by_team_for_user"">Packages By Owner</a></li>
          <li><a href=""/ac/brazil/directory/packages/prune-list"">Pruned Packages</a></li>
        </ul>
      </div>
      <div class='column'>
        <h3>Version Sets</h3>
        <ul>
          <li><a href=""https://code.amazon.com/version-sets/new"">Create</a></li>
          <li><a href=""https://code.amazon.com/version-sets/"">Browse</a></li>
        </ul>
      </div>
      <div class='business_card'>
        <h3>Need help?</h3>
        <ul>
          <li><a href=""https://w.amazon.com/index.php/BuilderTools/Product/Brazil_Package_Directory"">Package Directory Documentation</a></li>
          <li><a href=""https://i.amazon.com/issues/create?assignedFolder=27de5d2d-8357-4fe4-9344-7f9d95d94d6b&descriptionContentType=text%2Famz-markdown-sim&extensions%5Btt%5D%5Bimpact%5D=4"">Submit an Issue (problems or suggestions)</a></li>
          <li><a href=""https://w.amazon.com/index.php/BuilderTools/OfficeHours"">Office Hours</a></li>
        </ul>
        <div class=""browser_support"">
          <a href=""https://w.amazon.com/?BuilderTools/Browser_Support_Policy"">Browser Support Policy</a>
        </div>
      </div>
  </div>

  
<script type=""text/javascript"" src=""https://internal-cdn.amazon.com/devcentral.amazon.com/js/display.min.js?size=582""></script>


  <script type=""text/javascript"" src=""https://internal-cdn.amazon.com/is-it-down.amazon.com/javascripts/stripe.min.js""></script>
  <script type=""text/javascript"">
    // ""Is It Down?"" Stripe for Package Builder
    isItDownStripe(""brazil"", 2, 1);
  </script>

  </body>
</html>



";
        RegexOptions options = RegexOptions.Multiline;
        
        foreach (Match m in Regex.Matches(input, pattern, options))
        {
            Console.WriteLine("'{0}' found at index {1}.", m.Value, m.Index);
        }
    }
}
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for C#, please visit: https://msdn.microsoft.com/en-us/library/system.text.regularexpressions.regex(v=vs.110).aspx
Regular Expressions 101

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