recursive split string with a sign

split.js

const split = (sign = '/') => (str = '') => {
    if (!str.includes(sign)) return str.trim();
    const arr = str.split(' ');
    const signIndex = arr.findIndex(a => a.includes(sign));
    const scrapeStr = arr.slice(0, signIndex).join(' ');
    const splits = arr[signIndex].split(sign);
    const sliced = arr.slice(signIndex + 1).join(' ');
    const strs = [];
    for (const s of splits) {
        s && strs.push(split(sign)(`${scrapeStr} ${s} ${sliced}`));
    }
    return strs.join('\n');
};

const splitScrap = split('/');
console.log(splitScrap('Today/Tomorrow/Yesterday Hello/Hi there nice to meet/see you'));
const a = splitScrap('1/2/3/7 8/9 4');
console.log(a);

// Today Hello there nice to meet you
// Today Hello there nice to see you
// Today Hi there nice to meet you
// Today Hi there nice to see you
// Tomorrow Hello there nice to meet you
// Tomorrow Hello there nice to see you
// Tomorrow Hi there nice to meet you
// Tomorrow Hi there nice to see you
// Yesterday Hello there nice to meet you
// Yesterday Hello there nice to see you
// Yesterday Hi there nice to meet you
// Yesterday Hi there nice to see you
// 1 8 4
// 1 9 4
// 2 8 4
// 2 9 4
// 3 8 4
// 3 9 4
// 7 8 4
// 7 9 4