JSFiddle - React, Tailwind, and code Playground

HTML

<div class="saglink"><a title="bayan adana" href="http://www.site.co/adana-bayan/">Adana bayan</a>
</div>
<div class="saglink"><a title="bayan adiyaman" href="http://www.site.co/adiyaman-bayan/">Adıyaman bayan</a>
</div>
<div class="saglink"><a title="bayan afyon" href="http://www.site.co/afyon-bayan/">Afyon bayan</a>
</div>
<div class="saglink"><a title="bayan aksaray" href="http://www.site.co/aksaray-bayan/">Aksaray bayan</a>
</div>

JavaScript

$('a').filter(function () {
    return $(this).prop('href').toLowerCase().indexOf('afyon') > -1;
}).css('color', '#fff');