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I'm trying to take a string like "hello world : bye world" and get ["hello world"; ":" ;"bye world"].

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This is the simplest function I can think of to pass your test case.

let split (str:string) =
    str.Split ':'
    |> Seq.collect(fun x -> [":"; x.Trim()])
    |> Seq.tail
    |> Seq.toList

split "hello world : bye world" // ["hello world"; ":"; "bye world"]
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