title: How to Select certain String that is under the Mouse Cursor in C#-wpf?
body: <p>I'm working on a project which is in the C# language.  My question is: How can I detect the string which is under the Mouse Cursor and is between the "(" and ")"?  </p>
  
  <p>For example: I want to highlight "yahoo" in a textbox with this content when the mouse is over it: google(1) yahoo(2) apple(3) microsoft(4) ...</p>