input: Write a python function to find all numbers in a given string using regular expressions.
  assert find_numbers("There are 3 sets of consecutive numbers in this sentence: 12, 22 and 33.") == ['3', '12', '22', '33']
  assert find_numbers("No numbers here!") == []
  assert find_numbers("One number: 100.") == ['100']
output: def find_numbers(s):
      import re
      return re.findall(r'\d+', s)