using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"<(\/?)(html|head|body)[>\s]([^>]*)>?";
string input = @"<header class="">
<header>
<head class="">
<head>
<head><div>
<head ><div>
<head > <div>
<head ><!--";
foreach (Match m in Regex.Matches(input, pattern))
{
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