How to add a space after the 4th and 10th character

Question

I have a string consisting of 15 digits. For example, 347405405655278. I need to add a blank space after the 4th digit and then after the 10th digit making it look like 3474 054056 55278. Can I achieve this using a regular expression?

score 20 · Accepted Answer · edited Jun 22 '21 at 14:23

20

With the help of regular expression, you can use the given below code to achieve the desired result:

var result = "347405405655278".replace(/^(.{4})(.{6})(.*)$/, "$1 $2 $3");

edited Jun 22 '21 at 14:23

Peter Mortensen

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answered May 05 '14 at 07:38

Vikash Dwivedi

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Thank you for this elegant solution. I am trying to do something similar, but I need to add a space after each 3rd character counting from behind. This is for displaying a monetary amount. It should do something like this. $1000 -> $1 000; $20000 -> $20 000; $3000000 -> $3 000 000 etc. (ignore the '$' in the expression please, I just need to format the number). Is this possible? – phunder Jul 30 '19 at 15:08
This was featured on the Stack Overflow podcast, [episode 349](https://stackoverflow.blog/2021/06/22/podcast-349-the-no-code-apps-bringing-software-smarts-to-analog-services-disrupted-by-the-pandemic/), at 21 min 57 secs. – Peter Mortensen Jun 22 '21 at 14:26

score 15 · Answer 2 · edited Jun 22 '21 at 14:28

15

Do it with substring concatenation:

var data = "347405405655278";
data = data.substr(0, 4) + " " + data.substr(4, 6) + " " + data.substr(10);
console.log(data);
# 3474 054056 55278

Or if you want to use regular expressions badly, then as suggested by T.J. Crowder,

var result = "347405405655278".replace(/^(.{4})(.{6})(.*)$/, "$1 $2 $3");
console.log(result);
# 3474 054056 55278

edited Jun 22 '21 at 14:28

Peter Mortensen

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answered Apr 29 '14 at 12:49

thefourtheye

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the second and third would be substr(4,6) and substr(10) – guido Apr 29 '14 at 12:50
Or if you really, really want to throw rex at it: `var result = "347405405655278".replace(/^(.{4})(.{6})(.*)$/, "$1 $2 $3");` – T.J. Crowder Apr 29 '14 at 12:52
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@T.J.Crowder Thanks. Included that in the answer :-) – thefourtheye Apr 29 '14 at 12:54
substr() is now deprecated. Use substring() instead – digibake Mar 15 '22 at 15:09

sshashank124 · Answer 3 · 2014-04-29T12:56:15.930

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You can do search this:

(.{4})(.{6})(.*)

and replace with:

$1 $2 $3

This will match the first 4 characters, the next 6 characters and then the rest. The replace then replaces it with the 4 characters + space + 6 characters + space + the rest.

edited Apr 29 '14 at 12:56

answered Apr 29 '14 at 12:48

sshashank124

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JavaScript uses $1 not \1 https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/replace – epascarello Apr 29 '14 at 12:50
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@sshashank124: Frankly, due respect, it's still not all that useful with no context and no explanation. – T.J. Crowder Apr 29 '14 at 12:53

How to add a space after the 4th and 10th character

3 Answers3