input: Write a function to check if a given string contains any numbers.
  
  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("123hello")==True
  assert string_contains_number("")==False
  assert string_contains_number("abc123xyz")==True
output: def string_contains_number(string):
      pattern = re.compile("[0-9]")
      return pattern.search(string) != None