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<!DOCTYPE html>
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.4/jquery.min.js"></script>
</head>
<body >
<script>
var str = "I am years old!";
if (str.match(/^(?=.*[a-zA-Z])(?=.*[0-9])/)) {
$("body").text("it is ok");
}
else
{
$("body").text("Please type numeric and alphabetic characters");
}
</script>
</body>
</html>
$("p:contains(here is your text)").css("font-weight","bold");
or
$("p:contains(here is your text)").text("this is new text"); // original text will be overwritten
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