mismatch on plussed addresses

This recipe mismatched today.

My username <luomat(_at_)peak(_dot_)org> was followed by someone who had a 
username  
with a + in it.....

I thought this recipe was designed to only catch from 'luomat' to the next  
comma (specifically to avoid this potential problem)

:0:
* ^(To|Cc):.*luomat.*\+[^,]*
PlussBox

Help?

TjL