replace signs on a batch variable data

i make writing a field to the batch level (@B.CombinedExpected1) with data ,13, 2, 6,,,7 , 4,

is it possible to delete all commas and put between the numbers a hash sign ( something like that from ,13, 2, 6,,,7 , 4, to #13# 2#6#7 # 4). keep in mind that @B.CombinedExpected1 is not a field.
is it possible to do that nah how can i do it . also how can i trim the data of @B.CombinedExpected1


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