title: Convert this kind of hex string to a NSData/NSString
body: <p>I have this hex string:</p>
  
  <pre><code>\x5c30\x3032\x5f5c\x3337\x345c\x3334\x366f\x5c32\x3633\x5c30\x3136\x5c32\x3132\x5c32\x3234\x4e5c\x3236\x335c\x3231\x335c\x3337\x355c\x3335\x315c\x3232\x365c\x3337
  </code></pre>
  
  <p>How could I convert it to a NSString or NSData? I though of using C methods, but I'm not experienced in C :(</p>