JSFiddle - React, Tailwind, and code Playground

HTML

<script src="http://ajax.aspnetcdn.com/ajax/jquery.validate/1.13.1/jquery.validate.js"></script>
<form id="myform">
<input type="text" name="username" id="username">
<button>submit</button>
</form>

JavaScript

$.validator.addMethod("specialChar", function(value, element){ 
this.val = value;	
 	var patt = new RegExp(/[^A-z]/g);
  return !patt.test(value)
 },function(){return 'not allowed ' + this.val });

	$('#myform').validate({
		onfocusout:function(element){			
			this.element(element)
		},
		rules:{
			username:{
				required:true,
				specialChar:true
			}
		},
		
		messages:{
            "username": {
                required: "Please enter user name"
                
                
            }
			
            
		}
	})