Tryit Editor v2.9

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<!DOCTYPE html>
<html>
<body>

<p>Click the button to perfom a global, case-insensitive search for the letters "ain" in a string, and display the matches.</p>

<button onclick="myFunction()">Try it</button>

<p id="demo"></p>

<script>
function myFunction() {
    var str = "The rain in SPAIN stays mainly in the plain"; 
    var res = str.match(/ain/gi);
    document.getElementById("demo").innerHTML = res;
}
</script>

</body>
</html>