title: Substring Between two ( " ) signs in swift 4?
body: <p>I'm having a problem getting the substring of a string which includes two double-quotes <code>"</code>. 
  For example:  my desString is equal to ["39013"] </p>
  
  <p>I need to get: 39013</p>
  
  <p>But the problem is when I'm looking for the index of <code>"</code> signs, Swift sees that as a normal code, not as a specific character. How can I fix this?</p>
  
  <p>This is not duplicate, in this question he is asking <code>'</code> sign, but I am asking about <code>"</code> which is similar sign when you are printing a specific value (for example: print("dup"). This means, when I am trying to find the index of <code>"</code> char with <code>index(of """)</code> there are three of them and Xcode says one of them is missing. Actually it's not missing, I am looking for it. But THAT'S THE PROBLEM.</p>
  
  <p>Here is my code to find the indexes with <code>"["</code> and <code>"]"</code>.</p>
  
  <pre><code>let first = desString.index(of: "[") ?? desString.startIndex
  let last = desString.index(of: " ") ?? desString.endIndex
  let substring1 = desenString[first..&lt;last]
  </code></pre>