<a class="some-link">En<a/>
<a class="some-link">En<a/>
<a class="some-link">Ru<a/>
<a class="some-link">De<a/>
<a class="some-link">De<a/>
<a class="some-link">IT<a/>
var subject = $(".some-link").text();
var russian = /Ru/g;
var ruReg = subject.match(regex);
if ( ruReg ) {
$(".some-link").text().css("color", "yellow");
}
$(".some-link").each((i, el) => {
if ($(el).text().match(/Ru/g)) {
$(el).css("color", "yellow");
}
})