title: Regex for PO BOX Validation
body: <p>I am using the pattern:</p>
  
  <pre><code>var isPOAddress=/^(A\s*\.?\s*)(P\s*\.?\s*)(O\s*.?\s*)(Box+\*)|(Box\s+#?\d+)/gi;
  </code></pre>
  
  <p>My requirement is: the PO Box should not allow number after Box.</p>
  
  <p>E.g. Box123 or Box 123 should not be accepted.</p>