<!DOCTYPE html>
<html>
<body>
<p>Search for an "e" in the next paragraph:</p>
<p id="p01">The best things in life are free!</p>
<button onclick="myFunction()">Try it</button>
<p id="demo"></p>
<script>
function myFunction() {
text = document.getElementById("p01").innerHTML;
document.getElementById("demo").innerHTML = /e/.test(text);
}
</script>
</body>
</html>