i'm having trouble Formatting Email Address

I need a code to convert email address by default to below:

from jdoe@abc.com to JDoe@ABC.com.

I have the code to force the domain, but cant figure out how to return the name in the format above.

Thanks

Do all email names follow the "FirstInitial,LastName" format?

Is the domain (abc.com) the same for all records?

If so, then:

//replace "YOUR_FIELD" with field from your data
var YourField = Field("YOUR_FIELD");
var First2Letters = Left(YourField, 2);
var CorrectUser = YourField.replace(First2Letters, First2Letters.toUpperCase());
var NewEmail = CorrectUser.split("@",1) + "@ABC.com";
return NewEmail;