title: Extract text from a NSString using regular expressions
body: <p>I have a NSString in this format:</p>
  
  <p>"Key1-Value1,Key2-Value2,Key3-Value3,..."</p>
  
  <p>I need only keys (with a space after every comma):</p>
  
  <p>Key1, Key2, Key3, etc.</p>
  
  <p>I thought to create an array of components from the string using the comma as separator, and after, for every component, extract all characters since the "-"; then I'd serialize the array elements. But I fear this could be very heavy about performances.</p>
  
  <p>Do you know a way to do this using regular expressions?</p>