[Python] Regex a string with a space between words

import re

texto = "ABC ABC. ABC.png ABC thumb.png"

regex = r"ABC(?!.png)|ABC(?! thumb.png)"

novo = re.sub(regex, "bueno", texto)

print(novo)


I'm trying to replace the ABC word with exceptions. I only want to replace it if it doesn't follow the word ".png" or " thumb.png". The string would be then "ABC thumb.png"

I expected

bueno bueno. ABC.png ABC thumb.png


But the output is this

bueno bueno. bueno.png bueno thumb.png


It isn't detecting the space and it actually messes up the first condition.

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