title: Find and select words covered with curly brackets in a RichTextBox
body: <p>i'm designing a text editor with vs.net 2013 express.
  I want to select words covered with curly brackets ex:- {word} when i click on them.
  basic idea is- when i click on a word,program should check if that word is covered by curly
  brackets or not.if yes,it should select the whole word.</p>
  
  <p>i tried this whole day.but couldn't do it.Any help is appreciated.
  Thanks.</p>