JSFiddle - React, Tailwind, and code Playground

by Dmitri Ganenco

HTML

<script src="//code.jquery.com/jquery-3.3.1.slim.min.js"></script>
<link rel="stylesheet" href="//stackpath.bootstrapcdn.com/bootstrap/4.1.0/css/bootstrap.min.css">
<script src="//cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.0/umd/popper.min.js"></script>
<script src="//stackpath.bootstrapcdn.com/bootstrap/4.1.0/js/bootstrap.min.js"></script>
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css">
<form>
  <div class="form-row align-items-center">
    <div class="col-sm-3 my-1">
      <label class="sr-only" for="inlineFormInputName"></label>
      <input type="text" class="form-control" id="inlineFormInputName" placeholder="Enter code">
    </div>
    <div class="col-auto my-1">
      <button id="sub" type="submit" class="btn btn-primary">Submit</button>
    </div>
  </div>
</form>
<button id="hide" type="hide" class="btn btn-primary">not visible</button>

CSS

.row {
  background: #f8f9fa;
  margin-top: 20px;
}

.col {
  border: solid 1px #6c757d;
  padding: 10px;
}

JavaScript

$('#inlineFormInputName').on('input', function(){
	const pattern = new RegExp('^[0-9]');
});