How to extract two characters before last set of numbers in a string?

[jenkinsta]

Tried many variations but just cant get it right. 

Example Data:
onetwoap321.site
onethreap3ua.somesite
oneforpd210.site
one3ninaw1u.site

The string may or may not have characters after the last set of numbers. There may be another number but will be seperated by at least 2 letters before the last set of numbers. 

{string}{number optional}{2 letters}{number}{optional characters}{may or may not have . at end}

The two letters is what I want to capture in a field called Code. 

| rex field=Name "^(?<Code>[^.]+)"

Thanks for any help. 

[ITWhisperer · Accepted solution]

| rex field=Name ".*(?<Code>[a-zA-Z]{2})\d"

[jenkinsta]

I was so close at one point but didnt have the trailing \d. Thanks so much