Gmail to Google Sheets Script Help

I'm new to Google Scripts and struggling to optimize a code I've found.

I used this base to extract the emails from Gmail and feed them into a Google Sheet, and that's working fine.

However, I would like to either extract what is in the "getPlainBody()" String to another column or find some other way to separate out specific data from the body of the email.

I was trying to use (\d+(?:.\d{2}) from here to automatically record times, but I'm not sure where to input the function into my overall code (or if I need a separate code).

How would I do this?

Thanks!