<!DOCTYPE html>
<html>
<body>
<p>Click one of the buttons to perform a search for the characters "THIS" in a string.</p>
<button onclick="myFunction()">Global case-sensitive search</button>
<button onclick="myFunction2()">Global case-insensitive search</button>
<p id="demo"></p>
<script>
function myFunction() {
var str = "THIS This this";
var patt1 = /[THIS]/g;
var result = str.match(patt1);
document.getElementById("demo").innerHTML = result;
}
</script>
<script>
function myFunction2() {
var str = "THIS This this";
var patt1 = /[THIS]/gi;
var result = str.match(patt1);
document.getElementById("demo").innerHTML = result;
}
</script>
</body>
</html>