JSFiddle - React, Tailwind, and code Playground

HTML

<div class="text">11.02.19</div>
<div class="text">'1'.02.19</div>
<div class="text">123 11.02.19</div>
<div class="text">$ 11.02.19</div>
<div class="text">&nbsp;11.02.19</div>
<div class="text">1   &nbsp;   1</div>
<div class="text"> 1212</div>

<script src="https://code.jquery.com/jquery-3.1.0.js"></script>

CSS

.mark {
  color: green;
}

JavaScript

$('.text').each((i, node) => {
  /^[0-9]{1}/.test(node.innerText) && $(node).addClass('mark')
})