Meaning of そういえば in Japanese

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Definition of そういえば

そういえば(souieba) 【そう言えば】

(exp) which reminds me ...; come to think of it ...; now that you mention it ...; on that subject ...; so, if you say ...
そういえば、確かに太郎を見かけました。
Come to think of it, I did see Taro.

Now that I think of it, I've been asked to look at a haiku he'd written by the tipsy bloke sitting next to me on the train.

"Now that I think of it, where's Tanimoto?" "Playing the lone wolf, as always."

そういえば。やばい、秀樹に毒されてるわ。

Now that you mention it. Yeek, Hideki's habits are rubbing off on me!

Now that you mention it, what happened to that man who used to work here?

そういえば、確かにたしかに太郎を見かけました。

Come to think of it, I did see Taro.