I haven't seen anyone spell it out here, but the answer to your enigma
is the same as the reason that you didn't need to perform a sequence
of replacements:
The code is designed such that all replacements happen against the
original string.
So you would have to stringreplace again to complete the sequence you
were envisioning.
You probably already figured this out, but I thought I should still
mention it, in case it was bothering anyone.
Thanks,
--
Raul
On Fri, Dec 18, 2020 at 2:22 PM 'Michael Day' via Programming
<programm...@jsoftware.com> wrote:
>
> Thanks, Brian - I thought I needed to put in a temporary intermediate
> value to avoid
> reversing the first change, hence the three pairs rather than two.
>
> But the enigma remains, doesn't it: what stops ']' becoming ')' ? Do
> rplc and/or
> stringreplace only work on a maximum of two pairs of before and after?
>
> Peter Vernigorov's post is useful, but, again, avoids the difficulty
> by using an
> alternative function, one which I overlooked, I admit.
>
> Cheers,
>
> Mike
>
> On 18/12/2020 18:54, Brian Schott wrote:
> > What about the following?
> > ( '()',')(' ) stringreplace|. '1 + (2 * 3) + (4 * (5 + 6))'
> > ((6 + 5) * 4) + (3 * 2) + 1
> >
> > On Fri, Dec 18, 2020 at 1:21 PM 'Michael Day' via Programming <
> > programm...@jsoftware.com> wrote:
> >
> >> Unlike in the K forum, the J-wires have been virtually silent on this
> >> year's Advent of Code...
> >>
> >> Anyway, today's problem, number 18, might interest J & APLers as part
> >> 1 is ALMOST
> >> plug-it-in to J/APL; there's just one twist, so to speak, namely we
> >> need to reverse an
> >> arithmetic expression, eg
> >> 1 + (2 * 3) + (4 * (5 + 6))
> >> needs to be evaluated as
> >> ((6 + 5) * 4) + (3 * 2) + 1
> >>
> >> --
> > (B=) <-----my sig
> > Brian Schott
> > ----------------------------------------------------------------------
> > For information about J forums see http://www.jsoftware.com/forums.htm
>
>
> --
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