input: def html_to_text(html_string: str) -> str:
      """ Converts an HTML string to plain text by removing all HTML tags.
      >>> html_to_text('<p>Hello, <b>world</b>!</p>')
      'Hello, world!'
      >>> html_to_text('Hello, <br>this is a new line!</br>')
      'Hello, this is a new line!'
      """
output:     import re
      return re.sub(r'<[^>]+>', '', html_string)