title: C# Regex boundary with special characters
body: <p>I want to have a Regex that finds "Attributable".
  I tried <code>@"\bAttributable\b"</code> but the \b boundary doesn't work with special characters.</p>
  
  <p>For example, it wouldn't differentiate Attributable and Non-Attributable. Is there any way to Regex for <strong>Attributable</strong> and not it's negative?</p>