title: QString function for only alpha characters?
body: <p>I am newbie in QT(4.7.4) and I am search for function, that checks an QString for alpha-characters and returns "true" if in this QString contains only characters.
  Should I write this simple function myself? :( I hope it exists such function as isText() in VBA, but in Google and documentation I have not found it.</p>
  
  <p>Thanks for answers and sorry for my english :)</p>