Extract email addresses from FailingNodeStackTrace Flow Variable

My goal is to find which email address(es) are causing the Send Email node to have errors.

I am attempting to use existing Flow Variables to get this information, but I have run into trouble. The FailingNodeStackTrace flow variable has a very long string value, probably 1000’s of characters, but it has the email address(es) that I need. I wish to return only the email addresses from that long string, and nothing else.

Can someone help me out? I am open to using Python for generating a solution. I attempted a RegEx based solution earlier, but it’s having issues, and I don’t know if that’s because the string is too long or not.