JSFiddle - React, Tailwind, and code Playground

HTML

<a title"yo" href="#">1.</a>
<a title"PDF" href="#">1.</a>
<a title"specificTitle" href="#">1.</a>

CSS

a{background:yellow;}

JavaScript

$('a[title*="pdf"]').filter(function(){
    if(this.title.toLowerCase().indexOf("pdf") != -1)
         return $(this);
}).css({'background':'red'});