regex - Split Uppercase words in Excel

Question

I would like to split all words in my cell by Uppercase, an example:

Original values:

MikeJones
RinaJonesJunior
MichealSamuelsLurth

Expected output:

Mike Jones
Rina Jones Junior
Micheal Samuels Lurth

Can this be done without using VBA?

Answer 1

Having acknowledged Excellll's remarkable formula, the most efficient code solution would be RegExp based. This avoids long loops.

Function SplitCaps(strIn As String) As String
Dim objRegex As Object
Set objRegex = CreateObject("vbscript.regexp")
With objRegex
    .Global = True
    .Pattern = "([a-z])([A-Z])"
    SplitCaps = .Replace(strIn, "$1 $2")
End With
End Function