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Сообщение от ligisayan
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на выходе получить в данном случае:
<span class="quantity">3 × <span class="amount">57.000 руб.</span></span>
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Как вариант...
<!DOCTYPE html>
<html>
<head>
<script src='http://code.jquery.com/jquery-latest.js'></script>
<!--
<script src="https://code.angularjs.org/1.3.9/angular.min.js"></script>
<script src="https://code.angularjs.org/1.3.9/angular-route.js"></script>
<link rel='stylesheet type=text/css href=tmp.css' />
<link rel="stylesheet/less" type="text/css" href="style.less">
<script src="http://cdnjs.cloudflare.com/ajax/libs/less.js/2.5.0/less.min.js"></script>
-->
<style type='text/css'>
</style>
<script type='text/javascript'>
$(function(){
var number = 3;
var html=$(".quantity").html();
html=html.replace(/\d+/,number);
$(".quantity").html(html);
});
</script>
</head>
<body>
<span class="quantity">1 × <span class="amount">57.000 руб.</span></span>
</body>
</html>