JSFiddle - React, Tailwind, and code Playground

HTML

<form id="formid" method="POST">
    <input/>
</form>

JavaScript

$(function() {
    $("#formid").bind("submit", function(event) {
        $('input')
        .filter(function(){return $(this).val().indexOf("kill") !== false;})
        .each( function(index,element) {
            $(this).val($(this).val().replace(/kill/i, "kxll"));
        });
    });
});