<!DOCTYPE html>
<html lang="en-US">
<body>
<p>Click on the button to see the difference between * and ? in regexp</p>
<button onclick="myFunction()">Click me</button>
<p id="point"></p>
<script>
var x = document.getElementById("point");
function myFunction(){
var str = "2 25 255";
var pattern1 = /25*/g;
var pattern2 = /25?/g;
var result1 = "* = " +str.match(pattern1);
var result2 = "? = " +str.match(pattern2);
x.innerHTML = result1 +"<br>"+ result2;
}
</script> </body>
</html>