How to validate GST number using Regular Expression in jQuery


This following example shows, how to validate GST number using RegExp in jQuery on a text change event.

GSTIN Number Format :

GSTIN number validation
  
<!DOCTYPE html>
<html>
<head>
 <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.3/jquery.min.js"></script>
</head>
<body>      
 Enter GST Number : <input type="text" class="gst" >  
</body>
<script>      
$(document).ready(function () {      
 $(".gst").change(function () {    
  var inputtext = $(this).val();    
  var gstinformat = new RegExp('^[0-9]{2}[A-Z]{5}[0-9]{4}[A-Z]{1}[1-9]{1}Z[a-zA-Z0-9]{1}$'); 
  
  if (gstinformat.test(inputtext)) {    
   alert("GSTIN Number Format is Verified");
  } 
  else {    
   alert('Please Enter Valid GSTIN Number');    
  }    
    });          
 });          
</script>    
</html>
Try it Yourself