title: Zipcode validation for US
body: <p>Can any one tell me how can i validate zipcode for US using regular expression.</p>
  
  <p>I used below expression for validation</p>
  
  <pre><code>var us_postcode_regular = /^([0-9]{5})(?:[-\s]*([0-9]{4}))?$/;
  </code></pre>
  
  <p>However it is not able to validate all 00000 or 11111 or similar numbers.</p>
  
  <p>and how can i validate the incorrect zipcode like the five digits which are not the part of US zipcode.</p>