提取url域名正则表达

import re

def extract_domain(url):
    # 正则表达式匹配域名
    pattern = re.compile(r'(?:(?:https?|ftp):\/\/)?(?:\S+(?::\S*)?@)?((?:(?!-)[A-Za-z0-9-]{1,63}(?<!-)\.)+[A-Za-z]{2,6})')
    match = pattern.search(url)
    if match:
        return match.group(1)
    else:
        return None

# 测试
url = 'https://www.example.com/path/to/page?name=parameter&another=param'
domain = extract_domain(url)
print(domain)  # 输出: www.example.com

from urllib.parse import urlparse

def extract_domain(url):
    parsed_url = urlparse(url)
    return parsed_url.netloc

# 测试
url = 'https://www.example.com/path/to/page?name=parameter&another=param'
domain = extract_domain(url)
print(domain)  # 输出: www.example.com