string中获取域名

import re
from urllib.parse import urlparse

def get_domain(url):
    parsed_url = urlparse(url)
    domain = parsed_url.netloc
    if domain.startswith('www.'):
        domain = domain[4:]
    return domain

# 示例
url = "https://www.example.com/path/to/page?name=parameter&another=param"
print(get_domain(url))  # 输出: example.com

import re

def is_valid_url(url):
    regex = re.compile(
        r'^(?:http|ftp)s?://'  # http:// or https://
        r'(?:(?:[A-Z0-9](?:[A-Z0-9-]{0,61}[A-Z0-9])?\.)+(?:[A-Z]{2,6}\.?|[A-Z0-9-]{2,}\.?)|'  # domain...
        r'localhost|'  # localhost...
        r'\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})'  # ...or ip
        r'(?::\d+)?'  # optional port
        r'(?:/?|[/?]\S+)$', re.IGNORECASE)
    return re.match(regex, url) is not None

url = "https://www.example.com"
if is_valid_url(url):
    print(get_domain(url))
else:
    print("Invalid URL")

import idna

def get_domain_with_idn(url):
    parsed_url = urlparse(url)
    domain = parsed_url.netloc
    if domain.startswith('www.'):
        domain = domain[4:]
    try:
        domain = idna.decode(domain.encode('utf-8')).decode('utf-8')
    except UnicodeError:
        pass
    return domain

url = "https://例子.测试"
print(get_domain_with_idn(url))  # 输出: xn--fsq.xn--0zwm56d