treste 2

$("textarea").bind("copy cut", function(e) {
e.preventDefault();
e.stopPropagation();

// Fonte: http://stackoverflow.com/a/16036818/520779
var textComponent = this;
var startPos = textComponent.selectionStart;
var endPos = textComponent.selectionEnd;
var selectedText = textComponent.value.substring(startPos, endPos);

var exemploTransformacao = selectedText.toUpperCase();

// Fonte: https://datatables.net/blog/2014-01-31
var clip = new ClipboardEvent('copy');
clip.clipboardData.setData('text/plain', exemploTransformacao);
clip.preventDefault();

e.target.dispatchEvent(clip);
});