根据网址获取域名

from urllib.parse import urlparse

def get_domain(url):
    parsed_url = urlparse(url)
    domain = parsed_url.netloc
    return domain

# 示例
url = "https://www.example.com/path/to/resource?query=param"
domain = get_domain(url)
print(domain)  # 输出: www.example.com

import re
from urllib.parse import urlparse, unquote

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

def get_domain(url):
    if not is_valid_url(url):
        raise ValueError("Invalid URL")
    parsed_url = urlparse(unquote(url))
    domain = parsed_url.netloc
    return domain

# 示例
url = "https://www.example.com/path/to/resource?query=param"
try:
    domain = get_domain(url)
    print(domain)  # 输出: www.example.com
except ValueError as e:
    print(e)