Removing Commas before Space plus Letter Only

It is possible to enter a syntax into the Edit | Options | General | Characters for removal field that allows me to remove commas before (space +) letters, saving commas before (space +) numbers

So:

1. Remove comma before:

, bis
, dass
, damit
, der
, die
, den
, ob
, um

2. Save comma before:

Pos. (1, 2)
1,5 mm

Type the following regular expression in the Characters for removal field:

,(?=\s\D)

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