Convert MatchCollection variable into a string

I have a variable of type MatchCollection which is a collection of matches obtained from a Regex expression.
I want to convert this variable into a string so I can display it in a message box. How do I do this?

Any help would be greatly appreciated.

Assign Activity
arrValues | DataType: String Array =
yourMatchCollVar.Cast(Of Match).Select(Function (x) x.Value).toArray

strFlat = String.Join(" | " , arrValues)

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