using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"(?<=
<div>
(?:[^<]|<[^d]|<d[^i]|<di[^v]|<div[^>])*?
)
(?:[^<]|<[^d]|<d[^i]|<di[^v]|<div[^>])
(?=
(?:[^<]|<[^d]|<d[^i]|<di[^v]|<div[^>])*?
</div>
)";
string input = @"<div>< <span>Foo</span> ></div>
<div>< <span>Foo</span> v></div>
<div>< <span>Foo</span> iv></div>
<div>< <span>Foo</span> div></div>
<div>< <span>Foo</span> /div></div>
<div>< <span>Foo</span> </div></div>
<div><d <span>Foo</span> ></div>
<div><d <span>Foo</span> v></div>
<div><d <span>Foo</span> iv></div>
<div><d <span>Foo</span> div></div>
<div><d <span>Foo</span> /div></div>
<div><d <span>Foo</span> </div></div>
<div><di <span>Foo</span> ></div>
<div><di <span>Foo</span> v></div>
<div><di <span>Foo</span> iv></div>
<div><di <span>Foo</span> div></div>
<div><di <span>Foo</span> /div></div>
<div><di <span>Foo</span> </div></div>
<div><div <span>Foo</span> ></div>
<div><div <span>Foo</span> v></div>
<div><div <span>Foo</span> iv></div>
<div><div <span>Foo</span> div></div>
<div><div <span>Foo</span> /div></div>
<div><div <span>Foo</span> </div></div>
<div><div> <span>Foo</span> ></div>
<div><div> <span>Foo</span> v></div>
<div><div> <span>Foo</span> iv></div>
<div><div> <span>Foo</span> div></div>
<div><div> <span>Foo</span> /div></div>
<div><div> <span>Foo</span> </div></div>";
RegexOptions options = RegexOptions.Multiline | RegexOptions.IgnorePatternWhitespace;
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