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${item.inventorydetail?replace('/[a-z]/gmi', '', 'r')}

From the examples under <https://freemarker.apache.org/docs/ref_builtins_string.html#ref_builtin_string_flags> it looks like you don't use `//` around the regex

So I think you want `${item.inventorydetail?replace('[a-z]', '', 'rim')}` (`?replace` already replaces all occurrences, so you don't need `g`)