That 's why I filed the bug.

You'd expect that the copy function adapts to the syntax mode the builder is in.

On Tue, 9 Jul 2019, at 7:17 PM, Noam Postavsky wrote:

Lars Ingebrigtsen <larsi@gnus.org> writes:

> leo <devel@halloleo.hailmail.net> writes:
>
>>
>> 1. Start `re-builder'.
>> 2. Build a regex in `re-builder'
>> 3. Switch via C-c TAB to "string" syntax .
>> 4. Copy the regex via `reb-copy'
>>
>> The result cannot be pasted in any regex replace prompt, but that is
>> exactly the place where string syntax is used.
>
> This seems like a deliberate feature:
>
> ;; (The compiled string form will be copied by `reb-copy')

I agree it seems to be a deliberate decision, but I'm not so sure it's a
good one.