Pipeline to Pull information from an Outlook Subject

Hello,

I am looking for some assistance in adding some functionality to a live Pipeline (Attached picture)

I am currently pulling the PO # from a pipeline tag. 

Here is the code {{a.subject[-6:(a.subject|length)]}}

The email is a template that purchasing sends with our internal PO number as the last 6 digits of the email.

I would like to be able to pull the Vendor name from the email as well but my caveat to that is that the vendor names are varying lengths.

Does anyone have any suggestions on how to accomplish this?