Using Regex to Identify Specific Emails

Hi, first time posting here.

I am looking for a way to identify messages that match the following conditions using regex:

Sender's email address: FirstName.LastName@CompanyName.com Recipients email address: *FirstName*@*.com or *LastName*@*.com

If the Recipient's email address has either the FirstName or LastName from the Sender's address, can we identify this traffic and quarantine it for evaluation by an admin?

Is this possible using regex in FortiMail or any other way?

Thanks for the help.