Если я угадал - то, как вариант для затравки...
<!DOCTYPE html>
<html>
<head>
<meta http-equiv='Content-Type' content='text/html; charset=windows-1251' />
<script src='https://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>
-->
<style type='text/css'>
</style>
<script type='text/javascript'>
$(function(){
var txt=$('#test').text();
var re=/^|(\.\s).*?\[ololo\].*?(?=$|\n)/g;
alert(txt.match(re)[1]);
});
</script>
</head>
<body>
<p id='test'>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod<br />
tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam,<br />
quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo<br />
consequat. Duis aute irure [ololo] dolor in reprehenderit in voluptate velit esse<br />
cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non<br />
proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
</p>
</body>
</html>