input: Write a function to check if a given string contains any numbers. Use regular expressions to identify any numeric characters in the string. If the string contains any numbers, return True; otherwise, return False. If the string is empty, return False.
  
  assert string_contains_number("abc123") == True
  assert string_contains_number("abc") == False
  assert string_contains_number("") == False
  assert string_contains_number("123") == True
  assert string_contains_number("a1b2c3") == True
output: import re
  
  def string_contains_number(s):
      if not s:
          return False
      return bool(re.search(r'\d', s))