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("HelloWorld") == False
  assert string_contains_number("12345") == True
  assert string_contains_number("") == False
output: import re
  
  def string_contains_number(string):
      pattern = re.compile("[0-9]") 
      return pattern.search(string) != None