Replace 2 characters inside a string in JavaScript

Question

I have this string and I want to fill all the blank values with 0 between to , :

var initialString = 3,816,AAA3,aa,cc,bb,5.9,27,46,0.62,29,12,7,10,13.1,86,6.02,20,1.68,8,0.24,48,22,6.2,0.9,,,1,

I want this output :

var finalString = 3,816,AAA3,aa,cc,bb,5.9,27,46,0.62,29,12,7,10,13.1,86,6.02,20,1.68,8,0.24,48,22,6.2,0.9,0,0,1,0

I try to use replace

var newString = initialString.replace(/,,/g, ",0,").replace(/,$/, ",0");

But the finalString looks like this:
var initialString = 3,816,AAA3,aa,cc,bb,5.9,27,46,0.62,29,12,7,10,13.1,86,6.02,20,1.68,8,0.24,48,22,6.2,0.9,0,,1,0 Some coma are not replaced.

Can someone show me how to do it?

Your idea is correct, but the mistake you made is the regex consumes 2 commas at once. So it won't replace the last comma if there are odd number of commas. Using a lookahead solves this problem. — Hao Wu
– Hao Wu, Commented May 11, 2021 at 1:07

Nick · Accepted Answer · 2021-05-11 01:04:58Z

3

You can match a comma which is followed by either a comma or end of line (using a forward lookahead) and replace it with a comma and a 0:

const initialString = '3,816,AAA3,aa,cc,86,6.02,20,1.68,8,0.24,48,22,6.2,0.9,,,1,';

let result = initialString.replace(/,(?=,|$)/g, ',0');

console.log(result)

answered May 11, 2021 at 1:04

Nick

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1 Comment

Laetitia28 Over a year ago

Thanks a lot! You saved me lot of time and frustration.

DecPK · Accepted Answer · 2021-05-11 01:04:01Z

0

using split and join

var str = "3,816,AAA3,aa,cc,bb,5.9,27,46,0.62,29,12,7,10,13.1,86,6.02,20,1.68,8,0.24,48,22,6.2,0.9,,,1,";
const result = str
  .split(",")
  .map((s) => (s === "" ? "0" : s))
  .join(",");
console.log(result);

answered May 11, 2021 at 1:04

DecPK

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