I tried to copy the following line from Skype:
I got an error when I tried to paste it into another app to use it. So I pasted that into a hex editor and it looked like this in the hex editor:
I don't know if that was just a problem with copy from Skype or if it could happen in other applications. What I want to know is a way to copy and paste from applications on mac osx ignoring all these unwanted 'invisible' characters.