General :: Perform Action When Clipboard Contents Match Regex?

I use the Actions feature of KDE's Klipper utility to run certain commands when I copy something into the clipboard that matches a particular regular expression. Unfortunately, I have to turn on Enable Clipboard Actions and select the command from a menu every time I copy something that I want to run the command on. I'd like to have that command run automatically instead.

You'd think this was possible, as there is an automatic checkbox in the action settings dialog box:

Unfortunately, that appears to do nothing. The documentation included with Klipper does not indicate what that checkbox is supposed to do.

Is it possible to configure Klipper to run a command automatically if the contents of the clipboard matches a regular expression? If not, is there another way to accomplish this?