[Exim] Grouping allowed in system filter pcre?

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ThreadAuthorDate ()
MSheldon Hearn
MJohn Horne
MPhilip Hazel
MSheldon Hearn
M\Philip Hazel
|M\Sheldon Hearn
M||John Horne
||M\Philip Hazel
M|||Philip Hazel
||M|Sheldon Hearn
|||MJohn Horne
||MPhilip Hazel
M|Derrick 'dman' Hudson
|MDerrick 'dman' Hudson
MPhilip Hazel