[Tutor] regular expression question

[Mike Hall]

I'd like to get a match for a position in a string preceded by a specified word (let's call it "Dog"), unless that spot in the string (after "Dog") is directly followed by a specific word(let's say "Cat"), in which case I want my match to occur directly after "Cat", and not "Dog."

I can easily get the spot after "Dog," and I can also get it to ignore this spot if "Dog" is followed by "Cat." But what I'm having trouble with is how to match the spot after "Cat" if this word does indeed exist in the string.

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