input: Write a function to check if a given string contains any numbers. Use regular expression to search for any digits within the string. If the string contains at least one digit, return True; otherwise, return False.
  assert string_contains_number("abc123")==True
  assert string_contains_number("abc")==False
  assert string_contains_number("1a2b3c")==True
  assert string_contains_number("")==False
  assert string_contains_number("abc!@#")==False
output: import re
  
  def string_contains_number(s):
      return bool(re.search(r'\d', s))