title: string.Format, regex + curly braces (C#)
body: <p>How do I use string.Format to enter a value into a regular expression, where that regular expression has curly-braces in it already to define repetition limitation? (My mind is cloudy from the collision for syntax) </p>
  
  <p><em>e.g.</em> The normal regex is "<strong>^\d{0,2}</strong>", and I wish to insert the '2' from the property MaxLength</p>