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Let's say I have the following string: "Stackoverflow", and I want to insert a space between every third number like this: "S tac kov erf low" starting from the end. Can this be done with regexes?

I have done it the following way with a for-loop now:

var splitChars = (inputString: string) => {
    let ret = [];
    let counter = 0;
    for(let i = inputString.length; i >= 0;  i --) {
       if(counter < 4) ret.unshift(inputString.charAt(i));
       if(counter > 3){
        ret.unshift(" ");
        counter = 0;
        ret.unshift(inputString.charAt(i));
        counter ++;
       } 
       counter ++;
    }
    return ret;
}

Can I shorten this is some way?

Let's say I have the following string: "Stackoverflow", and I want to insert a space between every third number like this: "S tac kov erf low" starting from the end. Can this be done with regexes?

I have done it the following way with a for-loop now:

var splitChars = (inputString: string) => {
    let ret = [];
    let counter = 0;
    for(let i = inputString.length; i >= 0;  i --) {
       if(counter < 4) ret.unshift(inputString.charAt(i));
       if(counter > 3){
        ret.unshift(" ");
        counter = 0;
        ret.unshift(inputString.charAt(i));
        counter ++;
       } 
       counter ++;
    }
    return ret;
}

Can I shorten this is some way?

  • javascript
  • string
Share asked Aug 27, 2020 at 14:19 user12067722user12067722
Add a ment  | 

3 Answers 3

Reset to default 7

You could take a positive lookahead and add spaces.

console.log("StackOverflow".replace(/.{1,3}(?=(.{3})+$)/g, '$& '));

You can use Regex to chunk it up and then join it back together with a string.

var string = "StackOverflow";
var chunk_size = 3;
var insert = ' ';

// Reverse it so you can start at the end
string = string.split('').reverse().join('');

// Create a regex to split the string
const regex = new RegExp('.{1,' + chunk_size + '}', 'g');

// Chunk up the string and rejoin it
string = string.match(regex).join(insert);

// Reverse it again
string = string.split('').reverse().join('');

console.log(string);

This is a solution without regexp, with a for...of

<!DOCTYPE html>
<html>
<body>

<script>
const x="Stackoverflow",result=[];
let remaind = x.length %3 , ind=0 , val;

for(const i of x){
val = (++ind % 3 === remaind) ? i+" " : i; 
result.push(val); 
}

console.log(result.join(''));
</script>

</body>
</html>

本文标签： Javascript insert space at nth position in stringStack Overflow

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