jQuery, Get filename without the extension and then replace string

Ok, to only get the filename I used this:

var output = filename1.substr(0, filename1.lastIndexOf('.')) || filename1;

To do the replacement of characters I used this:

output = output.replace(/[^a-z0-9\s]/gi, '').replace(/[_\s]/g, '-');

There is a better way to get filename and extension

fileName = 'upload.png';

If you need only filename

filename.split('.').shift();

If you need only extension

filename.split('.').pop();