title: regex - and . _
body: <p>Writing a regex for a-z, A-Z and allowing - and . _ and integers.</p>
  
  <p>For example:</p>
  
  <ul>
  <li>Testing-Server1</li>
  <li>Testing.Server</li>
  <li><p>Testing_Server</p>
  
  <p>Tried this, but was unsure how to allow - _ .  and integers:</p>
  
  <p>"^[a-z][A-Z]*$"</p></li>
  </ul>