Example. We can extract the contents of the TITLE element from HTML. This is important for making sure your HTML is correct. After the code, we see the Regex parts in detail and more factors.
Tip The Regex looks for a start tag and an end tag. It ignores whitespace between the inner parts of the tags and the string.
using System;
using System.Text.RegularExpressions;
class Program
{
static void Main()
{
// Get an HTML string.
string html = "<html><title>Example.</title><body><p>...</p></body></html>";
// Get the title of the HTML.
Console.WriteLine(GetTitle(html));
}
/// <summary>/// Get title from an HTML string./// </summary>
static string GetTitle(string file)
{
Match match = Regex.Match(file, @"<title>\s*(.+?)\s*</title>");
if (match.Success)
{
return match.Groups[1].Value;
}
else
{
return "";
}
}
}Example.
Errors. This code is not flexible enough for some HTML documents. It won't work for complicated HTML, such as HTML that heavily uses attributes.
Also The logic assumes the HTML is lowercase, although this could be easily changed.
Summary. We can capture the contents of the TITLE and paragraph elements from HTML documents using the C# language. The regular expression can be hard to read, but it works in many situations.
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This page was last updated on Nov 7, 2023 (simplify).