input: Write a function to check if a given string contains any numbers. The function should return True if the string contains at least one number, otherwise return False. Use regular expressions to accomplish this task.
  
  def string_contains_number(string):
      pattern = re.compile("[0-9]") 
      return pattern.search(string) != None
  
  assert string_contains_number("Hello123") == True
  assert string_contains_number("Hello") == False
  assert string_contains_number("123") == True
  assert string_contains_number("abc123xyz") == True
  assert string_contains_number("") == False
output: def string_contains_number(string):
      pattern = re.compile("[0-9]") 
      return pattern.search(string) != None