JSFiddle - React, Tailwind, and code Playground
HTML
<script src="http://www.thimbleopensource.com/download/jquery/jquery.filter_input.js"></script>
<form>
<p>what is the deal</p>
<input type="text" id="test1"/>
<p>what is going on here?</p>
<input type="text" id="test2"/>
</form>
JavaScript
$(document).ready(function(){
$('#test1').filter_input({regex:'[a-z]'});
$('#test2').filter_input({regex:'[A-Z]'});
});