How can I loop through a string, replacing sections that match a pattern?
Question
I have the following HTML markup
<p>xxxx</p>
<pre>xxx</pre>
<p>xxxx</p>
<pre>yyy</pre>
I need to be able to change this to:
<p>xxxx</p>
<pre>ABC xxx ABC</pre>
<p>xxxx</p>
<pre>ABC yyy ABC </pre>
I had a suggestion to use:
var loDoc = XDocument.Parse(lcHTML);
foreach (XElement loElement in loDoc.Descendants("pre"))
This does extract all the pre elements but it doesn't give me a way to tie things together and reinsert code into the original string.
Is there another way I could do this that would allow me to make the code change I need. I was thinking of using split and splitting on the <pre>..</pre> but then that would not really give me what I need as I need to replace the code inside the <pre>...</pre>
3 answers
solution1
1 2012-10-05 06:18:49
One possibility is to use XDocument but it has to be valid XHTML and you need to introduce a root node:
public class Program
{
static void Main()
{
var doc = XDocument.Parse(
@"<html>
<p>xxxx</p>
<pre>xxx</pre>
<p>xxxx</p>
<pre>yyy</pre>
</html>"
);
foreach (var pre in doc.Descendants("pre"))
{
pre.Value = string.Format("ABC {0} ABC", pre.Value);
}
Console.WriteLine(doc);
}
}
Another possibility is to use Html Agility Pack :
public class Program
{
static void Main()
{
var doc = new HtmlDocument();
doc.LoadHtml(
@"<p>xxxx</p>
<pre>xxx</pre>
<p>xxxx</p>
<pre>yyy</pre>"
);
foreach (var pre in doc.DocumentNode.Descendants("pre"))
{
pre.InnerHtml = string.Format("ABC {0} ABC", pre.InnerHtml);
}
Console.WriteLine(doc.DocumentNode.OuterHtml);
}
}
solution2
0 2012-10-05 06:18:54
Get the XML Doc element from this link How to read HTML as XML?
using the doc element, try
XmlElement root = doc.DocumentElement;
XmlNodeList nodes = root.SelectNodes("pre");
foreach (XmlNode node in nodes) {
node.value = "ABC" + node.value + "ABC";
}
solution3
0 2012-10-05 06:24:05
How about using Strings instead of xml?
String xmlString = ... \\ get string representation from somewhere
xmlString = xmlString.Replace( "<pre>", "<pre>ABC " );
xmlString = xmlString.Replace( "</pre>", " ABC </pre>" );
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