Specific string counter

How to count specific character inside text and show number in its related element.

by nobuts

HTML

<script src="https://code.jquery.com/jquery-3.4.1.slim.js"></script>
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/css/bootstrap.css">
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.16.0/umd/popper.js"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/js/bootstrap.js"></script>
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.css">
<!-- 
  Bootstrap docs: https://getbootstrap.com/docs
-->

<div class="container">
  <div class="row">
    <div class="col-lg-4 counter">
      <strong>Input1</strong> <span class="text-danger"></span><br />
      <textarea name="input2a" rows="10" class="form-control" cols="5"></textarea><br />
    </div>
    <div class="col-lg-4 counter">
      <strong>Input2</strong> <span class="text-danger"></span><br />
      <textarea name="input3a" rows="10" class="form-control" cols="5"></textarea><br />
    </div>
    <div class="col-lg-4 counter">
      <strong>Input3</strong> <span class="text-danger"></span><br />
      <textarea name="input2b" rows="10" class="form-control" cols="5"></textarea><br />
    </div>
  </div>
</div>

CSS

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

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

JavaScript

$('.counter').on('keyup',function(){
	var str=$('textarea').val();
	var count = (str.match(/=/g) || []).length;
	$(this).find('span').html(count);
});

/* Sample data
 55=6 
 00=3 
 66=3 
 77=3 
 70=2 
 67=2 
 60=2 
 88=2 
 75=2 
 76=2 
 65=2 
 99=2 
 05=2 
 06=2 
 07=2 
 11=2 
 22=2 
 56=2 
 57=2 
 50=2 
 33=2 
 44=2 
 45=1 
 46=1 
 47=1 
 35=1 
 36=1 
 37=1 
 40=1 
 51=1 
 52=1 
 53=1 
 54=1 
 58=1 
 59=1 
 25=1 
 26=1 
 27=1 
 30=1 
 15=1 
 16=1 
 17=1 
 20=1 
 08=1 
 09=1 
 10=1 
 01=1 
 02=1 
 03=1 
 04=1 
 90=1 
 95=1 
 96=1 
 97=1 
 61=1 
 62=1 
 63=1 
 64=1 
 68=1 
 69=1 
 71=1 
 72=1 
 73=1 
 74=1 
 78=1 
 79=1 
 80=1 
 85=1 
 86=1 
 87=1 
*/