input: Write a function to extract file size information from the given string using the provided SIZE_PATTERN regex.
  assert extract_file_size('File size: <strong>1.23 GB</strong>') == ('1.23', 'GB')
  assert extract_file_size('File size: <strong>123 MB</strong>') == ('123', 'MB')
  assert extract_file_size('File size: <strong>456.78 KB</strong>') == ('456.78', 'KB')
output: import re
  
  def extract_file_size(text):
      SIZE_PATTERN = r'File size: <strong>([\d.]+) (\w+)</strong>'
      match = re.search(SIZE_PATTERN, text)
      if match:
          return match.group(1), match.group(2)
      return None