import re

pattern = "([A-Z0-9._%+-]+)@([A-Z0-9.-]+)"

# Inserting colum headers, applied after extract
pattern = "(?P<email>[A-Z0-9._%+-]+)@(?P<domain>[A-Z0-9.-]+)"

# Generates two columns
email_components = df["email"].str.extract(pattern, flags=re.IGNORECASE)