<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script src="http://code.jquery.com/jquery-latest.js"></script>
<!--
<link rel="stylesheet" type="text/css" href="tmp.css" />
-->
<style type="text/css">
</style>
<script type="text/javascript">
$(function () {
var txt = 'текст2';
$(".child").each(function (indx, element) {
if ($(element).is(':contains("' + txt + '")')) alert([indx, $(this).text()])
});;
});
</script>
</head>
<body>
<div class="main">
<div class="child">текст1</div>
<div class="child">текст2</div>
<div class="child">текст3</div>
</div>
</body>
</html>