Test case details

Preparation Code

<script> var str = "F9g.wEu.Fchjt.Y3.JM.mp4"; var regexp = /[.][A-Za-z0-9]+$/; </script>

Test cases

Test #1

regexp.exec(str)[0];

Test #2

str.match(regexp)[0];

Test #3

str.split('.').pop();

Test #4

str.substring(str.lastIndexOf("."));