title: Find Word in RegEx while ignoring special characters
body: <p>I am trying to find the word "string" in the following string and ignore any special characters in between.
  e.g.,</p>
  
  <p>String s = "this is a sample string. In this st@ring I would like to search my s%#tring";</p>
  
  <p>the result should be "3 matches": 
  string
  s@tring
  s%#tring</p>
  
  <p>It should simply ignore these characters @ % #</p>