JSFiddle - React, Tailwind, and code Playground

HTML

<div>
<p>
bla blab rkejre bla bla rrerte ehere errt
</p>
<div>

CSS

.someclass {
    color: red;
}

JavaScript

var yourstring="bla";

$('p:contains('+yourstring+')', document.body).each(function(){
      console.log(this);
      $(this).html($(this).html().replace(
            new RegExp(yourstring, 'g'), '<span class=someclass>'+yourstring+'</span>'
      ));
});