title: Angular UI-Mask Letters, Numbers Only, no spaces
body: <p>I'm new to Angular UI-Mask and I don't understand the documentation enough to do this.</p>
  
  <p>I'm trying to limit a text input to lowercase letters and numbers, no spaces should be allowed.</p>
  
  <p>I tried this:</p>
  
  <p><code>&lt;input type="text" ng-model="path" ui-mask="[a-z0-9]"&gt;</code></p>
  
  <p>And that didn't work.</p>
  
  <p>Also if they type in an uppercase character want it to just translate to lowercase.</p>