input: Write a python function to remove HTML tags from a given text.
  assert remove_html_tags("<p>This is a sample web page.<br>This text has <b>some</b> <i>html</i> tags.</p>") == "This is a sample web page.This text has some html tags."
  assert remove_html_tags("<div><h1>Title</h1><p>Paragraph.</p></div>") == "TitleParagraph."
  assert remove_html_tags("No HTML tags here!") == "No HTML tags here!"
output: def remove_html_tags(text):
      import re
      clean = re.compile('<.*?>')
      return re.sub(clean, '', text)