正则提取邮箱顶级域名

import re

def extract_top_level_domain(email):
    pattern = r'@([a-zA-Z0-9.-]+\.[a-zA-Z]{2,})'
    match = re.search(pattern, email)
    if match:
        return match.group(1)
    else:
        return None

# 示例
email = "example@example.com"
top_level_domain = extract_top_level_domain(email)
print(top_level_domain)  # 输出: example.com

import re

def extract_top_level_domains(text):
    pattern = r'@([a-zA-Z0-9.-]+\.[a-zA-Z]{2,})'
    matches = re.findall(pattern, text)
    return matches

# 示例
text = "example1@example.com, example2@example.net, example3@example.org"
top_level_domains = extract_top_level_domains(text)
print(top_level_domains)  # 输出: ['example.com', 'example.net', 'example.org']