I initially hit the same issue and then changed my approach to avoid using
stringreplace.
The logic I ended up with was: find the first and last match of any of the
digits or number words,
combine those two into a single string and now replace words with digits on
those knowing that
there's no chance of overlaps.
SPOILERS BELOW:
s =: 0 : 0
two1nine
eightwothree
abcone2threexyz
xtwone3four
4nineeightseven2
zoneight234
7pqrstsixteen
)
NB. initial "replace" verb that had the same issue
r=:rplc&(','cut'zero,0,one,1,two,2,three,3,four,4,five,5,six,6,seven,7,eight,8,nine,9')
nums=:','cut'one,two,three,four,five,six,seven,eight,nine,1,2,3,4,5,6,7,8,9'
NB. working "replace" verb
r=:{{
f=.(nums{~]i.<./@-.&0) ,(<./@-.&0)"1 I.E.&(' ',y) &> nums
l=.(nums{~]i.>./@-.&0) ,>./"1 I.E.&(' ',y) &> nums
". -.&' ' (>f,l) rplc
(','cut'zero,0,one,1,two,2,three,3,four,4,five,5,six,6,seven,7,eight,8,nine,9')
}}
+/ r &> LF cut s
281
On Sat, Dec 2, 2023 at 12:29 PM David Pinchbeck <[email protected]> wrote:
> I'm trying to improve my J using Advent of Code, but am already a bit
> stuck on the second part of day 1. It seems late enough in the day now to
> ask this question without spoiling anything.
>
> On the example code one needs to turn the string 'eightwothree' into '8wo3'
> I tried the following, which fails because the priority of stringreplace
> comes from the left argument ordering:
>
> digs=:'0123456789'
>
> s=:'zero';'one';'two';'three';'four';'five';'six';'seven';'eight';'nine'
>
> substr=:(s,. <"0 digs)
>
> g=:{{ substr stringreplace y}}
>
> g 'eightwothree'
>
> eigh23
>
> How can I get the earliest appearance on the right side to be replaced
> first instead?
>
> Thanks,
> David
> --
> David Pinchbeck
> Associate Professor of Mathematics
> St. Joseph's College
> Standish, ME
> ----------------------------------------------------------------------
> For information about J forums see http://www.jsoftware.com/forums.htm
>
----------------------------------------------------------------------
For information about J forums see http://www.jsoftware.com/forums.htm
