Removing a parent tag of a string until his closing tag from Html string

Question

i have a very long string, what i am, trying to accomplish is delete a section in that string from the <tr> parent tag of the string to his closing tag </tr>. (hope i am clear enough).

So when i call The method RemoveSection with the text "Search Integration"

Html before

  <tr>
    <td class=\"SectionHeaderHolder\" colspan=\"4\">
    <p class=\"SectionHeader\">Header XX<span class=\"help\">Help</span></p>
    </td>
    </tr>

    <tr>
    <td class=\"SectionHeaderHolder\" colspan=\"4\">
    <p class=\"SectionHeader\">Search Integration<span class=\"help\">Help</span></p>
    </td>
    </tr>

    <tr>
    <td class=\"SectionHeaderHolder\" colspan=\"4\">
    <p class=\"SectionHeader\">Header YY<span class=\"help\">Help</span></p>
    </td>
    </tr>

The string that Remove function gets will be under <p class=\"SectionHeader\">
There will be only one section with that string- so the first occurrence should be handled by the remove function.

Html after

 <tr>
    <td class=\"SectionHeaderHolder\" colspan=\"4\">
    <p class=\"SectionHeader\">Header XX<span class=\"help\">Help</span></p>
    </td>
    </tr>
   
    <tr>
    <td class=\"SectionHeaderHolder\" colspan=\"4\">
    <p class=\"SectionHeader\">Header YY<span class=\"help\">Help</span></p>
    </td>
    </tr>

Espen Lønnkvist · Accepted Answer · 2016-09-07 08:58:40Z

You could use HtmlAgilityPack for this. A simple LinqPad example:

void Main()
{
    string input = "<tr><td class=\"SectionHeaderHolder\" colspan=\"4\"><p class=\"SectionHeader\">Header XX<span class=\"help\">Help</span></p></td></tr>"
                + "<tr><td class=\"SectionHeaderHolder\" colspan=\"4\">    <p class=\"SectionHeader\">Search Integration<span class=\"help\">Help</span></p>    </td>    </tr>"
                + "<tr><td class=\"SectionHeaderHolder\" colspan=\"4\">    <p class=\"SectionHeader\">Header YY<span class=\"help\">Help</span></p>    </td>    </tr>";

    HtmlDocument doc = new HtmlDocument();
    doc.LoadHtml(input);

    doc.DocumentNode.SelectSingleNode("//p[text()='Search Integration']").ParentNode.ParentNode.Remove();

    string output = doc.DocumentNode.OuterHtml;

    input.Dump();
    output.Dump();
}

user2316116 · Accepted Answer · 2016-09-07 14:20:00Z

1

While I'd still recommend the accepted solution, same thing can be done using plain regex

string search = "Search Integration";

string pattern = "<tr(?:(?!/?<tr).)*" + search + "(?:(?!/?tr).)*/tr>";
Regex r = new Regex(pattern, RegexOptions.Singleline);
string result = r.Replace(text, "");

Demo: https://dotnetfiddle.net/OcV6E5

answered Sep 7, 2016 at 14:20

user2316116

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