using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"(<([a-z]+)[^<>]*>[^<>]*(?R)*[^<>]*<\/\2>)|(<[a-z]+[^<>]*\/>)";
string input = @"<html>aaa<b></b><img src=”dfdfdfd” /> test </html>
<html fdfdfdskjf hsdkjfh skjdf hdskj>aaa<b></b><img src=”dfdfdfd” /> test </html>
<a><b /></a>
<html>aaa<b></b><img src=”dfdfdfd”> df </img></html>
<html>aaa<b><c/></b></html>
<html> aaa <b><c src=”dfdfdfd” /></b> aaa </html>
<html>aaa<b></b><img src=”dfdfdfd”> df </img></html>
<a><b /></a>
<b />
<a></a>
invalid:
<a><b></a></b>";
RegexOptions options = RegexOptions.Multiline;
foreach (Match m in Regex.Matches(input, pattern, options))
{
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