parse links from html source

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how to parse links (link1.php, link2.php...) from the source shown below add them for example in a listbox?
i want to parse links only where the "span class="visitext">VISIT"
i tried with functions GetElementsByTagName, GetElementById and GetAttribute but simply do not know how to add the condition "VISIT"

<a href="link1.php" target="_blank"> VISIT</a>
<a href="link2.php" target="_blank"> VISITED</a>
<a href="link3.php" target="_blank"> VISITED</a>
<a href="link4.php" target="_blank"> VISIT</a>

Posted 22-May-11 9:56am

h3adr00m

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Christian Graus · Answer 1 · 2011-05-22T10:06:00

Solution 1

Well, it seems to me like simple string mashing will work, given that the link is always in the same place, but I'd say reguarly expressions are the most robust way to do it.

Posted 22-May-11 10:06am

Christian Graus

Yvan Rodrigues · Answer 2 · 2011-05-22T15:52:00

If you know the document is well-formed XHTML you can use XPath and/or LINQ. Sorry, I don't know VB, but hopefully this is self-explanatory.

using System;
using System.Xml;
using System.Xml.Linq;
using System.Xml.XPath;

...

var xhtml = "put your xhtml here";
var xml = XDocument.Parse(xhtml);
var visitNodes = xml.XPathSelectElements("//span[@class='visit']/a/@href");
var links = from n in visitNodes select n.Value;

foreach(var l in links)
Console.WriteLine(l);

If you're stuck with .NET 2.0 or older, you can do the same thing with a few more lines of code using XmlDocument instead of XDocument.

If the HTML isn't well-formed, you'll need to use regular expressions. Here's a good starting point.[^]