Hi,

You can attach to the OnClientPasteHtml property of RadEditor and modify the pasted content when the Paste command is executed, e.g.

<script type="text/javascript">
function OnClientPasteHtml(sender, args)
{
    var commandName = args.get_commandName();
    var value = args.get_value();
    
    if (commandName == "Paste")
    {
        re = /“/gi;
        re1 = /”/gi;
        value= valuereplace(re, "\"").replace(re1, "\"");

        args.set_value(value);  //set the modified content in the editor
    }
}
</script>

Greetings,
Rumen
the Telerik team