input: Write a function that checks if a given string contains any numbers. The function should use a regular expression for this purpose and return True if the string contains any numbers, otherwise return False. Below are some *test cases that needs to be added further*.
  assert string_contains_number("abc123")==True
  assert string_contains_number("abc")==False
  assert string_contains_number("123")==True
  assert string_contains_number("a1b2c3")==True
  assert string_contains_number("")==False
output: import re
  
  def string_contains_number(s):
      return bool(re.search(r'\d', s))