Question

This is my code :

​var myStr = "/private_images/last-edit/image-work-med.png";​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​

and I’d like to replace the last 7 chars (med.png) with big.png. Or, as you can see, the last occurence after a - split.

How can I do it? I think about regex, but I’m not a champion with them. Tried :

myStr = myStr .replace(/-([^-]*)$/, "big" + '$1');

but it replace the last -, not the last occurence. So the result is /private_images/last-edit/image-workbigmed.png

Answer 1

You could use a regex, or you could use a few string methods and make your intentions clear.

var idx = myStr.lastIndexOf("-");
var newStr = myStr.substring(0, idx) + "big.png";