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Best way to perform batch edits in a TM’s custom field?

Hello,

I want to perform global edits in a custom field (text, allows multiple values) that's included in a large TM.

Changes such as this: from “R1_C1_AS” to “R1_C1_AS_ANOC”. The change will always occur after the last “_”.  Simple enough when there is only one value but most TUs have a number of those values.

I suppose I should consider the use of regex in batch edits but I wonder if there is any other, perhaps simpler, way to proceed.

Any recommendation you may have would be greatly appreciated.