如何查邮箱的域名

import re

def extract_domain(email):
    match = re.search(r'@([\w.-]+)', email)
    if match:
        return match.group(1)
    return None

email = "example@gmail.com"
domain = extract_domain(email)
print(domain)  # 输出: gmail.com

def is_valid_email(email):
    pattern = r'^[a-zA-Z0-9_.+-]+@[a-zA-Z0-9-]+\.[a-zA-Z0-9-.]+$'
    return re.match(pattern, email) is not None

email = "example@gmail.com"
if is_valid_email(email):
    domain = extract_domain(email)
    print(domain)
else:
    print("Invalid email address")

def extract_domain(email):
    match = re.search(r'@([\w.-]+)', email)
    if match:
        return match.group(1)
    return None

email = "user.name+tag@subdomain.example.co.uk"
domain = extract_domain(email)
print(domain)  # 输出: subdomain.example.co.uk