Finding the position of words in a string

My Task

I am trying to find the position of words appearing in a string using regex

Code

import re

# A random string

mystr = "there not what is jake can do for you ask what you play do for spare jake".upper() 

match = re.search(r"[^a-zA-Z](jake)[^a-zA-Z]", mystr)

print match.start(1)

Output

18

Expected output

I would expect my output to contain the positions of the string jake:

5, 17

EDIT: To clarify, I'm trying to identify the position of words. I believe what I have done is found the index and am unsure how to make it work as I expect