I am getting a lot of informational emails like "You've got a new message from ..." or "Notification of Donation Received", which often do not contain any information in the subject so that I have to open the email to see who sent the message or who donated which amount.

I'd love to be able to make TB parse incoming emails and then display something interesting instead of the original subject, e.g. by defining a regular expression pattern.

I know how to write regular expressions, but I do not know whether there is a way or an addon to modify the displayed text in the messages view.

EDIT for clarification: I would like donation notifications from Paypal not to be displayed as original

Notification of Donation Received

but rather

Paypal: John Doe has donated 50$