You could use
, @~a{}
with a space between `,` and `@`.
Since that's sometimes too ugly, though, `@` has special handling of
comma that effectively swaps the order of the `@` and `,`. So, you
could use
@,~a{}
to get the effect of
,@~a{}
without `,` combining `@`.
Note that if you just wanted to unquote `~a`, then you'd have to use
vertical bars to prevent `@,` from acting like `,@`:
@|,~a|{}
Although
@pregexp{\d\.\d}
s much nicer than
#px"\\d\\.\\d"
beware that the former will compile the regexp every time the
expression is evaluated. Maybe we can eventually fix that. Meanwhile,
be sure to lift the expression to a module-level definition.
At Sat, 11 Mar 2017 15:31:54 +, Stephen De Gabrielle wrote:
> Hi,
>
> Is there any way I can use the terse forms of quasiquote with at-exp?
>
> I want to use @expressions{} inside a quasi quoted list, but the unquote
> comma captures the at-sign at ,@a~{}
>
> I'm trying to achieve the following with the at-exp
>
> ;working example
> #lang at-exp racket
> (require racket/random)
> (define (path)
> (random-ref '["stream""brook" "path" "ravine" "forest" "fence" "stone
> wall"]))
>
> (~a "beyond the " (path) ", ")
> @~a{beyond the @(path), }
>
>
> (random-ref
> `(
>,(~a "beyond the " (path) ", ")
> ;,@~a{beyond the @(path) })
>,(~a "along the " (path) ", ")
> ;,@~a{beyond the @(path) })
>))
>
> My reason is I find at-expressions more readable.
>
> Kind regards,
>
> Stephen
>
> PS: Ive been very excited by at-exp since I read
> http://www.greghendershott.com/2015/08/at-expressions.html
> I despise double escaping, because I always make a mistake, so this made me
> very happy:
>
> @pregexp{\d\.\d} ; #px"\\d\\.\\d"
>
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