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HTML

<html>
    
    <body>
        <div>
            <label>Company Email</label>
            <input id="email" type="text" />
        </div>
    </body>

</html>

JavaScript

//staring the plugin 
(function ($) {
    $.fn.checkCompDomain = function (options) { //exending the jQuery object with new method 
        var self = this; 
    //access the option passed to the plugin 
        var event = options.on;  //event to watch 
        var success = options.success || (function () {}); //success method 
        var error = options.error || (function () {});// error method 
        var company_domain = options.domain || null; //domain is optional 

        //method to check whether email address is right
        function validateEmail(email) {
    var regex = /^([\w-]+(?:\.[\w-]+)*)@((?:[\w-]+\.)*\w[\w-]{0,66})\.([a-z]{2,6}(?:\.[a-z]{2})?)$/i;
    return regex.test(email);
        }


        // a local method to validate the email address with domain passed
        function check() {
            var value = self.val();  //connecting email address pass in input tag
            // check whether a valid email address 
            if(validateEmail(value)) {
               var domain = value.split("@")[1]; // check entered email domain 
            if (company_domain !== null) { // check domain if passed as option 
                
                return domain == company_domain
            }
                
                
                return true;
            }
            return false;
        }

         // defining user defined event 
        if (typeof event != "String") {  
            self.bind(event, function () {
                if (check()) {
                    success.call(self); 
                } else {
                    error.call(self);
                }
            });
        }


    };

})(jQuery);


$(function () {

    $('input#email').checkCompDomain({
        on: 'keyup', // events can be "blur" or "focus" when to run the validation 
        domain: "istacksoftware.com", // optional parameter to valid the domain of the email address 
        success: function () {
            $(this).css("background-color",...