Mailwasher Pro Regex: Does it support negative lookbehind?

[David Jenkins]

Wondering if the MW Pro regex engine supports negative lookbehind?

Trying to figure out how to refuse any mails containing 'xyz' provided the 'xyz' is not preceded by 'stu'.

And as a follow up: What regex engine/flavor does MW use?

[ataraxy]

The regex MailWasher uses is mentioned in viewtopic.php?f=50&t=33181&p=134601#p134601 though when I clicked on the link I got a warning from Malwarebytes. So you may want to proceed with caution.