title: Regular expression(max 3 letters and one or more dots in every possible order)
body: <p>I am trying to make a regular expression for a pattern that will contain 4 characters in which there will be one or more dots (".") without order
  (<em>Example : asd. , .afd , .AF.</em> )</p>
  
  <p>So far i got this <strong>[a-zA-Z(.+)]{4}</strong> but it doesn't seem to work ( it matches both alex and ale. ).</p>