On 30-07-2022 22:44, Maxime Devos wrote:
>
>> "All I want to do" is to replace some placeholder (in this case <?>) 
>> in an arbitrary form. No matter how that form looks or how deeply it 
>> is nested, if there are <?> inside of it, I want to replace them. Is 
>> this impossible?
>>
> Yes, see e.g. the replace-placeholder+replace-result-placeholder I 
> sent, subject to the limitations of messy nesting semantics. However ... 
Oops, double negative etc.  Correction: No, this is not impossible, it's 
possible, see e.g. the [...]