问验证打印正则表达式的页面范围

EN

const isNumeric = input => !isNaN(input) // you may also check if the value is a nonzero positive integer
const isOrdered = (start, end) => parseInt(start) < parseInt(end)
const isRangeValid = range => range.length == 2 && range.every(isNumeric) && isOrdered(range[0], range[1])
const isSingleValid = single => single.length == 1 && isNumeric(single[0])

function f(input) {
    const inputs = input.split(',').map(x => x.trim());

    for (const x of inputs) {
        if (!x) return false;
        const pages = x.split('-');
        if (!isSingleValid(pages) && !isRangeValid(pages))
            return false;
    }

    return true;
}

console.log(f("1, 3, 6-9"))
console.log(f("1-5, 5"))
console.log(f("6, 9"))

console.log(f(",5"))
console.log(f("5-,9"))
console.log(f("9-5,"))
console.log(f("2,6-"))
console.log(f("10-1"))
console.log(f("56-0"))