title: regular expression no characters
body: <p>I have this regular expression</p>
  
  <pre><code>([A-Z], )*
  </code></pre>
  
  <p>which should match something like
  <code>test,</code> (with a space after the comma)</p>
  
  <p>How to I change the regex expression so that if there are any characters after the space then it doesn't match.
  For example if I had:</p>
  
  <pre><code>test, test
  </code></pre>
  
  <p>I'm looking to do something similar to</p>
  
  <pre><code>([A-Z], ~[A-Z])*
  </code></pre>
  
  <p>Cheers</p>