aoc2023/day1.moon

import aoc from require"utils"
rex = require "rex_pcre2"

aoc 1, 1, =>
    sum = 0
    for k in @gmatch "(%w+)"
        digits = {}
        for i = 1, #k
            if string.match (k\sub i, i), "%d"
                digits[#digits + 1] = k\sub i, i
        sum += tonumber (digits[1] .. digits[#digits])
    sum

aoc 1, 2, =>
    regex = "([0-9]|on(?=e)|tw(?=o)|thre(?=e)|four|fiv(?=e)|six|seve(?=n)|eigh(?=t)|nin(?=e)).*?"
    rewrite = {
        on: "1",
        tw: "2",
        thre: "3",
        four: "4",
        fiv: "5",
        six: "6",
        seve: "7",
        eigh: "8",
        nin: "9"
    }
    sum = 0
    for k in @gmatch "(%w+)"
        digits = {}
        for d in rex.gmatch k, regex
            digits[#digits + 1] = rewrite[d] or d
        sum += tonumber (digits[1] .. digits[#digits])
    sum