regex negative look around with 2 adjacent matches

Question

Should be an easy question from someone out there:

If I run this JavaScript:

var regex = new RegExp(\"(?!cat)dog(?!cat)\",\"g\");
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Answer 1

Your regex simplifies to dog(?!cat) (because the first lookbehind consumes nothing), so it is replacing any instance of dog that is not followed by cat.

Try the regex (?!cat).{3}dog(?!cat)