JSFiddle - React, Tailwind, and code Playground

HTML

<body>
  <p id="hello">TH Scanning</p>
  <table>
    <tr>
      <th>Head 1</td>
      <th>*Head 2</td>
      <th>Head 3</td>
      <th>Head *4</td>
    </tr>    
    <tr>
      <td>Column 1</td>
      <td>Column 2</td>
      <td>Column 3</td>
      <td>Column 4</td>
    </tr>    <tr>
      <td>Column 1</td>
      <td>Column 2</td>
      <td>Column 3</td>
      <td>Column 4</td>
    </tr>    <tr>
      <td>Column 1</td>
      <td>Column 2</td>
      <td>Column 3</td>
      <td>Column 4</td>
    </tr>
  <table>
</body>

CSS

.special { background-color: #ff9999; }
  th, td { border: solid .1em #999999 }

JavaScript

$(function() {
    $("table tr th").each(function() {
        if ($(this).text().indexOf('*') > -1)            
            $(this).addClass("special");            
    });
});