title: Custom string variable in regex
body: <p>I want to find two or more variable in a string with Regex. For instance I have an string like this "Result = Num + 2 ( 6 * Count )". I want to find out if "Result", "Num" and "Count" are in this string or not. Suppose that I want to build a small compiler and these Strings are my reserved words and I want to use regex for this checks.</p>
  
  <p>Case sensitive is more important for me. For example if client inputs "num" or "count" in a string, the method must return false.</p>
  
  <p>How can I do it in C#?</p>