Question

How to extract a number from string in Node.js

Answer 1

const s = 'node.js 18 programming';
 
const str_n = s.replace(/\D/g, ''); 
console.log(str_n + " " + typeof str_n);

let n;
 
if (str_n !== '') {
    n = Number(str_n); 
}
 
console.log(n)
 
 
 
 
 
/*
run:
 
18 string
18
 
*/

 

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Answer 2

const s = 'node.js 18 programming';

const arr = s.match(/\d+/);
console.log(arr);
 
let n;
 
if (arr !== null) {
    n = Number(arr[0]); 
}
 
console.log(n)
 
 
 
 
 
/*
run:
 
[ '18', index: 8, input: 'node.js 18 programming', groups: undefined ]
18
 
*/

 

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