Splitting a string into chunks by numeric or alpha character with JavaScript

Question

I have this:

var str = A123B234C456;

I need to split it into comma-separated chunks to return something like this:

A,123,B,234,c,456

I thought a regular expression would be best for this, but I keep getting stuck. Essentially, I tried to do a string replace, but you cannot use a regular expression in the second argument.

I would love to keep it simple and clean and do something like this, but it does not work:

str = str.replace(/[\d]+/, ","+/[\d]+/);

But in the real world that would be too simple.

Is it possible?

i alarmed alien · Accepted Answer · 2018-10-15 08:17:35Z

7

It may be more sensible to match the characters and then join them:

str = str.match(/(\d+|[^\d]+)/g).join(',');

But don't omit the quotes when you define the string:

var str = 'A123B234C456';

edited Oct 15, 2018 at 8:17

i alarmed alien

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answered May 19, 2011 at 14:42

kennebec

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1 Comment

Paul Over a year ago

Wow! Sometimes you just get caught up in over complexity. That worked perfectly!

Peter Mortensen · Accepted Answer · 2020-08-19 11:25:56Z

2

The string split method can be called with a regular expression.

If the regular expression has a capture group, the separator will be kept in the resulting array.

So here you go:

let c = "A123B234C456";
let stringsAndNumbers = c.split(/(\d+)/); // ["A", "123", "B", "234", "C", "456", ""]

Since your example ends with numbers, the last element will be empty. Remove empty array elements:

let stringsAndNumbers = c.split(/(\d+)/).filter(el => el != ""); // ["A", "123", "B", "234", "C", "456"]

Then join:

let stringsAndNumbers = c.split(/(\d+)/).filter(el => el != "").join(","); // "A,123,B,234,C,456"

edited Aug 19, 2020 at 11:25

Peter Mortensen

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answered Jul 4, 2019 at 7:40

nico pr

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Comments

Peter Mortensen · Accepted Answer · 2020-08-19 11:26:49Z

0

You can do it by replace() using a regular expression.

For example,

var str = "A123B234C456";
str = str.replace(/([a-bA-B])/g, '$1,');

Now the value of str will be 'A,123,B234,C456'.

edited Aug 19, 2020 at 11:26

Peter Mortensen

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answered May 19, 2011 at 14:47

Senad Meškin

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