JSFiddle - React, Tailwind, and code Playground

HTML

<p>This is some copy. In this copy is the word hello</p>
<p>This is some copy. In this copy is the word <a href="">hello</a></p>

JavaScript

$('p').each(function(){    
    if($(this).find('a').length > 0) return;  
    lastSpaceIndex = $(this).text().lastIndexOf(' ');
    if(lastSpaceIndex  == -1)
        lastSpaceIndex = 0;    
    WordToReplace = $(this).text().substring(lastSpaceIndex);
    idx = $(this).text().lastIndexOf(WordToReplace);
    resultstring = $(this).text().substring(0, idx); 
    $(this).html(resultstring);
    $(this).append($( "<a href='#'>" + WordToReplace  + "</a>"));
});