input: Write a python function to extract all URLs from a given webpage's HTML content.
  assert extract_urls('https://www.example.com/')==['http://example.com/page1', 'http://example.com/page2']
  assert extract_urls('https://www.test.com/')==['http://test.com/home', 'http://test.com/about']
  assert extract_urls('https://www.demo.com/')==['http://demo.com/contact', 'http://demo.com/blog']
output: import re
  import requests
  
  def extract_urls(url):
      response = requests.get(url)
      html_content = response.text
      urls = re.findall(r'href=[\'"]?([^\'" >]+)', html_content)
      return urls