The point of using /(?=(the .*? dog))/gi here is that look around assertions are zero length, i.e. after they match at position P, the next match is not searched at their end, but at the position P + 1, so you can find overlapping matches, as well.
لսႽ† ᥲᥒ⚪⟊Ⴙᘓᖇ Ꮅᘓᖇ⎱ Ⴙᥲ𝇋ƙᘓᖇ

In reply to Re^3: Pattern matching: Lazy vs. greedy by choroba
in thread Pattern matching: Lazy vs. greedy by false_friend

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