The strange phenomenon of sublime using regular search

first look at the normal, focusing on \ s {1} here, because it matches a space, so here matches the third one.
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(?<=SERVICE_URL":\s{2}").+(?=")

(?<=SERVICE_URL":\s{0,3}").+(?=")
(?<=SERVICE_URL":\s?").+(?=")

:
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does not write OK in zero-width assertions, so this is a loophole in sublime regular search for zero-width assertions? Can"t you add a quantitative limit to a zero-width assertion?

Sep.16,2021
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