Regex discussion on Adevent of Code 2023 - Day 1 Part 2

regex-discussion.ts

const regex = /(\d)/gmi;

const regex2 = new RegExp(`(?=(?<digit>[0-9]|one|two|three|four|five|six|seven|eight|nine|zero))`, 'gmi') 

const input = 'afsdone2f537826sdf5sixf';

const letters = {
    one: 1,
    two: 2,
    three: 3,
    four: 4,
    five: 5,
    six: 6,
    seven: 7,
    eight: 8,
    nine: 9,
    zero: 0
}

const r3 = +'5'
r3

const result = [...input.matchAll(regex2)]

const first = result[0].groups.digit

const r1 = isNaN(+first) && letters[first];

r1 

const second = result[result.length - 1].groups.digit

const r2 = isNaN(+second) && letters[second];

r2