input: Write a function that checks if a given string contains any numbers. The function should return True if the string contains at least one number, otherwise it should return False. If the string is empty, the function should also return False. The function should use regular expressions to determine if there are any numbers in the given string.
output: import re
  
  def contains_number(s):
      if not s:
          return False
      return bool(re.search(r'\d', s))