var symbol = $("div.price > h5 > div.num").text().replace(/[d.]*/, "");

<div class="price">
        <h5 class="biguns">
            <div class="num">
                €12.28
            </div>
            Lowest Price Per Night
        </h5>
    </div>

var symbol = $("div.price > h5 > div.num").text().replace(/[d.]+/g, "");

var symbol = $("div.price > h5 > div.num").text().replace(/d+.?d+/, "");

var symbol = $(".num").text().substr(0,1);