使用 str.replace() 匹配多个数字

Question

My string is returning as empty when attempting to replace it with specified digits from the string.

const input = 4w12d3h;
let days = 0;

if (/d/.test(input)) {
    days = input.replace(/.*(\d*)d.*/, '$1');
}

I expect the output to be '12' but it returns as ''. If I instead do (\\d) or (\\d+) it will return as the digit before the letter (2), but I need to match as many digits as exist before the letter.

Answer 1

You can use match also to get the desired output

 const input = '4w12d3h'; let days = 0; if (/d/.test(input)) { days = input.match(/(\\d+)d/); } console.log(days[1])