title: Multiple substrings in between the same delimiters
body: <p>I am new to c++ and would like to know how to extract multiple substrings, from a single string, in between the same delimiters? </p>
  
  <p>ex.</p>
  
  <blockquote>
    <p>"{("id":"4219","firstname":"Paul"),("id":"4349","firstname":"Joe"),("id":"4829","firstname":"Brandy")}"</p>
  </blockquote>
  
  <p>I want the ids:</p>
  
  <blockquote>
    <p>4219 , 4349 , 4829</p>
  </blockquote>