Format number string using commas

Question

I want to format numbers. I have seen some of the regex expression example to insert comma in number string. All of them check 3 digits in a row and then insert comma in number. But i want something like this:

122 as 122
1234 as 1,234
12345 as 12,345
1723456 as 17,23,456
7123456789.56742 as 7,12,34,56,789.56742

I am very new to regex expression. Please help me how to display the number as the above. I have tried the below method. This always checks for 3 digits and then add comma.

function numberWithCommas(x) {
    return x.toString().replace(/\B(?=(\d{3})+(?!\d))/g, ",");
}

But i want comma every 2 digits except for the last 3 digits before the decimals as shown above.

u want answer in regex or javascript.. or tell what u have tried?? — FrontEnd Expert
– FrontEnd Expert, Commented May 30, 2012 at 5:42
@Learner What do you mean "in regex or javascript"? The answer can, and likely will, be both. — Sampson
– Sampson, Commented May 30, 2012 at 5:43
@Learner : Yes i know. I mean to say i dont want any complicated solution because it is pretty simple and can be done in few lines though am not able to do it properly — user850234
– user850234, Commented May 30, 2012 at 5:48
@user850234 Then show us your solution and we will help you figure out the problem. That will help you to learn the language and we won't have to do YOUR work. — Andreas
– Andreas, Commented May 30, 2012 at 5:54

row1 · Accepted Answer · 2012-05-30 06:08:31Z

11

The result will depend on your browsers locale. But this might be an acceptable solution:

(7123456789.56742).toLocaleString();

Outputs:

7,123,456,789.56742

Try it and see if it outputs 7,12,34,56,789.567421 in your locale.

answered May 30, 2012 at 6:08

row1

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2 Comments

user850234 Over a year ago

@Jack : Sorry i saw now i have written the wrong comment. Thanks for noticing.

user850234 Over a year ago

No i am not getting the output 7,12,34,56,789.567421

KooiInc · Accepted Answer · 2012-05-30 06:17:42Z

Here's a function to convert a number to a european (1.000,00 - default) or USA (1,000.00) style:

function sep1000(somenum,usa){
  var dec = String(somenum).split(/[.,]/)
     ,sep = usa ? ',' : '.'
     ,decsep = usa ? '.' : ',';
  return dec[0]
         .split('')
         .reverse()
         .reduce(function(prev,now,i){
                   return i%3 === 0 ? prev+sep+now : prev+now;}
                )
         .split('')
         .reverse()
         .join('') +
         (dec[1] ? decsep+dec[1] :'')
  ;
}

Alternative:

function sep1000(somenum,usa){
  var dec = String(somenum).split(/[.,]/)
     ,sep = usa ? ',' : '.'
     ,decsep = usa ? '.' : ',';

  return xsep(dec[0],sep) + (dec[1] ? decsep+dec[1] :'');

  function xsep(num,sep) {
    var n = String(num).split('')
       ,i = -3;
    while (n.length + i > 0) {
        n.splice(i, 0, sep);
        i -= 4;
    }
    return n.join('');
  }
}
//usage for both functions
alert(sep1000(10002343123.034));      //=> 10.002.343.123,034
alert(sep1000(10002343123.034,true)); //=> 10,002,343,123.034

[edit based on comment] If you want to separate by 100, simply change i -= 4; to i -= 3;

function sep100(somenum,usa){
  var dec = String(somenum).split(/[.,]/)
     ,sep = usa ? ',' : '.'
     ,decsep = usa ? '.' : ',';

  return xsep(dec[0],sep) + (dec[1] ? decsep+dec[1] :'');

  function xsep(num,sep) {
    var n = String(num).split('')
       ,i = -3;
    while (n.length + i > 0) {
        n.splice(i, 0, sep);
        i -= 3;  //<== here
    }
    return n.join('');
  }
}

Sorry actually want 10,00,23,43,123.034 and not 10,002,343,123.034 so removed the accepted answer

Mily Dahlke · Accepted Answer · 2015-04-01 18:41:32Z

3

use toLocaleString(); It automatically handles inserting commas and will also handle uk strings the right way

e.g. var num=63613612837131; alert(num.toLocaleString());

answered Apr 1, 2015 at 18:41

Mily Dahlke

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Comments

Malcolm · Accepted Answer · 2013-05-15 07:26:46Z

0

Below is the snippet of code, can be done in better way but this works :D

function formatDollar(num) 
{
var p = num.toFixed(2).split(".");
var chars = p[0].split("").reverse();
var sep1000 = false;
var newstr = '';
var count = 0;
var count2=0;
for (x in chars) 
{ 
count++;
if(count%3 == 1 && count != 1 %% !sep1000) 
{ 
newstr = chars[x] + ',' + newstr;
sep1000=true;
} 
else 
{ 
if(!sep1000)
{
newstr = chars[x] + ',' + newstr;
}
else
{
count2++;
if(count%2 == 0 && count != 1) 
{ 
newstr = chars[x] + ',' + newstr;
} 
else 
{ 
 newstr = chars[x] + newstr;
}
}
}
}
return newstr + "." + p[1]; 
}

answered May 15, 2013 at 7:26

Malcolm

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